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Shin MATSUOKA
1985 Volume 51 Issue 461 Pages
3-11
Published: January 25, 1985
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Masaru KIYA, Kyuro SASAKI, Masao YASUKAWA
1985 Volume 51 Issue 461 Pages
12-18
Published: January 25, 1985
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Ryozo ISHIWATA, Hideo OHASHI
1985 Volume 51 Issue 461 Pages
19-27
Published: January 25, 1985
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Kazuyuki KAGE, Kazuyasu MATSUO, Sigetoshi KAWAGOE, Minoru NAGATAKE
1985 Volume 51 Issue 461 Pages
28-33
Published: January 25, 1985
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Yutaka YAMADA, Shigeki IMAO, Kenji TOYOZUMI
1985 Volume 51 Issue 461 Pages
34-42
Published: January 25, 1985
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Ichiro SAKATA, Masaru KIYA, Akira TSUKADA
1985 Volume 51 Issue 461 Pages
43-50
Published: January 25, 1985
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Hiroyuki HASHIMOTO, Seiichi SUDO
1985 Volume 51 Issue 461 Pages
51-59
Published: January 25, 1985
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Osami KITO
1985 Volume 51 Issue 461 Pages
60-65
Published: January 25, 1985
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Keiji KYOGOKU, Tsuneo SOMEYA
1985 Volume 51 Issue 461 Pages
66-73
Published: January 25, 1985
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Teruo KUMAGAI, Akihide KOBAYASHI
1985 Volume 51 Issue 461 Pages
74-84
Published: January 25, 1985
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Yoshiaki TSUCHIYA, Yoshiaki HANEDA, Choji HORIKOSHI, Takashi SATO
1985 Volume 51 Issue 461 Pages
85-94
Published: January 25, 1985
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Kazuyuki SHIZAWA, Takahiko KANAHASHI
1985 Volume 51 Issue 461 Pages
95-105
Published: January 25, 1985
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Hisayoshi KADO, Yoshiki FUJIWARA, Yoshinobu HOSOKAWA, Masahiro TAKIMOT ...
1985 Volume 51 Issue 461 Pages
106-114
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Masashi SANO
1985 Volume 51 Issue 461 Pages
115-124
Published: January 25, 1985
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Koji KIKUYAMA, Mitsukiyo MURAKAMI, Eiji ASAKURA, Isao OSUKA, Jinsheng ...
1985 Volume 51 Issue 461 Pages
125-133
Published: January 25, 1985
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Tatushi KANEKO, Naomichi HIRAYAMA
1985 Volume 51 Issue 461 Pages
134-142
Published: January 25, 1985
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Tomitaro TOYOKURA, Toshiaki KANEMOTO, Toshiaki SUZUKI, Tetsu SATO
1985 Volume 51 Issue 461 Pages
143-151
Published: January 25, 1985
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Kunio HIJIKATA, Yasuo MORI, Shigeru KAWAGUCHI
1985 Volume 51 Issue 461 Pages
152-159
Published: January 25, 1985
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Yasuo MORI, Kunio HIJIKATA, Hiroshi ISHIGURO
1985 Volume 51 Issue 461 Pages
160-168
Published: January 25, 1985
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Genichiro KUSHIDA, Hiroshi YAMASHITA, Ryotaro IZUMI
1985 Volume 51 Issue 461 Pages
169-176
Published: January 25, 1985
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Genichiro KUSHIDA, Hiroshi YAMASHITA, Ryotaro IZUMI
1985 Volume 51 Issue 461 Pages
177-184
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Izuo AYA, Hideki NARIAI
1985 Volume 51 Issue 461 Pages
185-194
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Takeo SAITOH, Kozo FUKUDA
1985 Volume 51 Issue 461 Pages
195
Published: January 25, 1985
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Fumihiko NISHIZAWA, Toshitaka KUROKI, Katsuya NAGATA
1985 Volume 51 Issue 461 Pages
196-204
Published: January 25, 1985
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Kengo SASAGUCHI, Hideaki IMURA, Masamichi YOSHIDA, Shinjiro KATSUO
1985 Volume 51 Issue 461 Pages
205-213
Published: January 25, 1985
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Kiichiro TAKEUCHI, Kozo ISHIDA, Yoshinobu YOSHIHARA, Nobuhiko FUKATANI
1985 Volume 51 Issue 461 Pages
214-221
Published: January 25, 1985
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Takao INAMURA, Nobuki NAGAI
1985 Volume 51 Issue 461 Pages
222-231
Published: January 25, 1985
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Masateru SHIMOTSU, Toshiyasu SHIMONAKA, Toshiaki SUMA, Seiichi NOGAMI
1985 Volume 51 Issue 461 Pages
232-240
Published: January 25, 1985
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Mamoru FUJIEDA, Yoshishige OOYAMA, Teruo YAMAUCHI
1985 Volume 51 Issue 461 Pages
241-247
Published: January 25, 1985
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Michikata KONO, Kazuo HATORI, Kazuo IINUMA
1985 Volume 51 Issue 461 Pages
248-256
Published: January 25, 1985
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Masanori SHIMIAZU, Masatara ARAI, Hiroyuki HIROYASU
1985 Volume 51 Issue 461 Pages
257-264
Published: January 25, 1985
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Kenshun OYAKAWA, HIRAYAMA.Naomichi
1985 Volume 51 Issue 461 Pages
265-270
Published: January 25, 1985
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Static blade boundary layers, outlet flow angles and total pressure drop through annular cascades have been measured removing the boundary layers on annulus walls, in order to male clear the effects of an inward radial movement of fluid in the blade boundary layers. The numerical solution of velocity profiles in laminar and turbulent boundary layers on the blades agreed with experimental data.
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Yutaka YAMADA, Shigeki IMAO, Katsunori YAMADA, Motoaki TODA
1985 Volume 51 Issue 461 Pages
271-279
Published: January 25, 1985
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The flow between concentric cylinders with both cylinders rotating in the same direction has been studied by visualization and velocity measurement. We used slit illumination for flow observation and pitot ant hot wire probe for velocity measurement and pitot hot wire probe for velocity measurement and yield the following results. When the outer cylinder rotates faster than the inner cylinder, the flow is stabilized and laminar flow region is fairly wide but there is a fluctuation which is too small to observe. The boundary which spiral turbulence occurs has marked hysteresis and changes with using fluid. Taylor vortices which occur when the inner cylinder rotates faster than the outer cylinder usually have vortex boundary dislocations. The outer region of the gap is affected by the Tayler vortex faster the the inner region.
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Masaru SUMIDA, Kouzou SUDOU
1985 Volume 51 Issue 461 Pages
280-287
Published: January 25, 1985
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Numerical solutions are presented of oscillatory laminar flow in curved pipes of square cross-section for a wide of parameters Dean number D and dimensionless frequency α. Velocity profiles, stream lines of secondary flow and distributions of wall shear stress area calculated and the effects of D and α on the flow pattern are made clear. Depending on D and α one to three pairs of vortices are induced in the cross section, varying periodically. The relation between the kinetic energy of the secondary flow and the influence of curvature on the flow is discussed.
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Ikuo NAKAMURA, Takashi WATANABE
1985 Volume 51 Issue 461 Pages
288-294
Published: January 25, 1985
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The transverse velocity component, the growth of the boundary layer and the transverse curvature cause self-induced favorable pressure gradient for the flow on a rotating circular cylinder in an axial flow. When the external pressure gradient is adverse, the effect of this favorable pressure gradient influences boundary layer separation and also the flow development downstream of this separation point. The types of post-separation behavior can be classified into several flow patterns varying with the ratio of the transverse surface velocity to the typical axial velocity. In this paper, by perturbing the solution for some surface velocity, the solution for slightly different surface velocity is obtained and the influence of change of the surface to typical axial velocity ratio is investigated. The first-order and second-order perturbations are calculated and it is shown that the change of flow pattern can be predicted by the present perturbation method.
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Tsutomu ADACHI, Kazuo MATSUUCHI, Satoshi MATSUDA, Tatsuo KAWAI
1985 Volume 51 Issue 461 Pages
295-299
Published: January 25, 1985
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Pressure distribution and vortex shedding were measured in a cryogenic wind tunnel from subcritical up to transcritical Reynolds numbers(10
5 ≤ R
e ≤ 10
7 ) and Mach numbers up to 0.3 without changing experimental arrangement. Drag coefficients were calculated using pressure distributions. Pressure distributions and drag coefficients show characteristic changes for subcritical, lower transition, critical, under transition and transcritical Reynolds number ranges respectively. Strouhal number takes constant value with an increase in Reynolds number for 10
5 ≤ R
e < 3.2 × 10
5. Narrowband vortex shedding could not be measured in the critical Reynolds number range ( 3.2 × 10
5 ≤ R
e ≤ 6.9 × 10
5). It was also measured again in the upper transition and transcritical Reynolds number ranges. Spectra of the pressure distributions and velocity fluctuations measured are presented for several characteristic values of Reynolds numbers. Results are also compared with those of the other authors.
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Hisataka TAMURA, Masaru KIYA, Akito TOI
1985 Volume 51 Issue 461 Pages
300-307
Published: January 25, 1985
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The time-mean and fluctuating forces acting on a circular cylinder placed in and near a turbulent plane mixing layer and its vortex-shedding properties were experimentally investigated. Reynolds number based on the cylinder diameter d and the main-flow velocity outside the mixing leyer was 3.4 × 10
4 and 4.3 × 10
4 for the force measurements and in a range 5.5 × 10
3 ∼ 4.4 × 10
4 for the measurement of the vortex-shedding properties. When the parameter d/δ, δ being a width of the mixing layer, was of the order of 2.0m the time-mean force showed a sharp maximum near the center of the mixing layer : the r.m.s, force was larger by about 40 percent near the edge of the mixing layer than in the main flow. Strouhal number of vortex-shedding was found to be smaller when the cylinder was immersed in the mixing layer than when it was in a uniform main flow. The extent of the reduction and lateral positions where the reduction began were dependent on the parameter d/δ.
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Kyuro SASAKI, Masaru KIYA
1985 Volume 51 Issue 461 Pages
308-316
Published: January 25, 1985
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Studied in this paper is the three-dimensional structure of large-scale vortices in the reattaching zone of a separation bubble formed at the leading edge of a blunt flat plate with right-angled corners. Contours of two-point correlations of surface-pressure and velocity fluctuations and conditionally-averaged velocity-vector fields in several space-time domains revealed a loop-type structure of the large-scale vortices ; the height of the vortex core is about 0.18 x
R, x
R being the bubble length, from the plate surface ; the distance between legs is 0.6 x
R ; the legs incline by an angle 56 to the surface. A qualitative picture of the large-scale cortices is proposed.
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Yasuhiro SUZUKI, Masaaru KIYA
1985 Volume 51 Issue 461 Pages
317-324
Published: January 25, 1985
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Effects of free-stream turbulence on a series of two-dimensional separated-reattaching flows ( separation bubbles ) were investigated experimentally in a low speed wind tunnel. Models tested were two-dimensional triangular cylinders with a tail plate. Some important properties of the separation bubbles were measured with a split-sensor driven by constant-temperature hot-wire anemometers. The effect of the turbulence on the reattachment length was found to be not uniform with respect to the separation angle. Large-scale vortices were formed by coalescence in the reattaching zone of the shear layer and were shed downstream with a non-dimensional frequency 0.65U
o/x
R, which was the same for all combinations of the separation angle and the free-stream turbulence employed in this study. Geometry of the separated shear layer suggested that the large-scale vortices in the reattaching zone became flatter as x
R increased.
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Yasuki NAKAYAMA, Toru YAMAMOTO, Katsumi AOKI, Hiroaki OHTA
1985 Volume 51 Issue 461 Pages
325-332
Published: January 25, 1985
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The relative flow patterns of a centrifugal blower impeller were visualized on the planes of hub, intermediate and shroud by the spark tracing method simultaneously visualizing stream lines, that indicates the flow direction. The stationary image of flow patterns in the impeller was observed using the rotating image stopping processor in which a triangular prism rotates at the half angular velocity of the impeller, and quasi three-dimensional relative flow velocity distribution were obtained. Experiments were carried out in the region of small, design and large flow rates and the flow patterns of each region became clear. The surging phenomena were observed clearly at the small flow rate.
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Yasukata TSUTSUI, Hikaru MATSUMIYA
1985 Volume 51 Issue 461 Pages
333-337
Published: January 25, 1985
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The flow behind rotor of a Vertical Axis wind Turbine (VAWT) wind tunnel model was measured by means of a two-dimensional hot-wire anemometer system to investigate the flow around VAWT. It is ordinary that the flow behind wind turbine rotors in decelerated downstream. In the flow measurement, however, we observed a peculiar and interesting phenomenon which showed that the flow behind rotor is accelerated downstream under a certain condition. The mechanism of the phenomenon was made up clear as follows : Because of the finite chord length of rotating blades, the blade in the downstream position acts as a propeller, then slow behind rotor is accelerated downstream. A modified two-stage momentum analytical model is presented and it is showed that the calculated results and the experimental results are in good agreement.
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Masahiro INOUE, Kenji KANEKO, Toshiaki SETOGUCHI
1985 Volume 51 Issue 461 Pages
338-344
Published: January 25, 1985
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In order to improve the Wells turbine performances, effects of guide vanes with circular-arc profile have been investigated by model testing under steady operation condition. The results have been compared with those of the case without guide vanes. It is found that the running characteristics as well as the starting characteristics are extremely improved by equipping guide vanes. The improvement is mainly due to diffuser of the outlet guide vanes.
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Nobuaki WAKISAKA
1985 Volume 51 Issue 461 Pages
345-349
Published: January 25, 1985
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An experiment of heat transfer of turbulent air flow was carried out through the abruptly expansion rectangular duct. The reattachment flow region was defined by evaluation the local static pressure difference on the wall. The measurement of temperature distribution in the slow was also conducted. Several problems found from the experiment were furthermore investigated by other's data. As the heat transfer characteristics were resulted to depend upon the distance from the inlet to the reattachment on the duct wall, a local Nusselt number equation was proposed considering the factor of duct expansion area ratio. The observed maximum heat transfer coefficient near the reattachment point was influenced by the remarkable greater temperature gradient, which reduced the apparent heat transfer rates, between separation bubble and main flow in the upstream separated slow region.
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Kenji TAKAHASHI, Wataru NAKAYAMA, Heikichi KUWAHARA
1985 Volume 51 Issue 461 Pages
350-355
Published: January 25, 1985
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Heat transfer to water slowing inside the tubes having three-dimensional ribs was investigated experimentally. The ribs are composed of primary ribs and rows of dents intersecting the ribs at certain angles or, they are composed of primary ribs and rows of dents intersecting the ribs at certain angles or, they are reduced to the rows of protuberances by employing a different manufacturing technique. Among the tubes tested, the one having primary ribs of 0.5 mm high and dents of 0.5 mm deep from their crests spiralling with respect to the tube axis at angels of 30°and -30°, respectively, shows the most favorable performance of high heat transfer rate and relatively low pressure drop. When applied to the design of a shell-and-tube heat exchanger, the above ribs and also the protuberances are effective in reducing the heat exchanger volume.
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Tetsu FUJII, Kan-ei SHINZATO
1985 Volume 51 Issue 461 Pages
356-360
Published: January 25, 1985
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There are shown considerable discrepancies among existing diagrams, tables and empirical equations concerning pressure loss coefficient, Euler number, for tube banks of ten or more rows. In the sake of practical application, simple expressions are proposed for the diagrams of typical in-line and staggered tube arrangement in Heat exchanger Design Handbook in the range 10 ≤ R
e ≤ 2 × 10
5 ∼10
6 within an accuracy of ±3%. Procedure of the formulation and an interpolation technique for applying to the cases of the other tube arrangement, namely the other pitch to diameter rations, are shown by using some examples. Also in proposed a new method of correlation for experimental data on tube banks with small number of rows.
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Toshio AIHARA, Shigenao MARUYAMA
1985 Volume 51 Issue 461 Pages
361-364
Published: January 25, 1985
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A numerical analysis is made of laminar free convection in vertical ducts with Uniform Heat Flux, in consideration of temperature-dependence of fluid thermophysical properties. The local Nusselt number of Constant Property Solutions can be wall correlated with the dimensionless parameters derived by the authors, regardless of the exit Rayleigh number, Prandtl number, and circular tube or parallel plates. The CPS of free-convective heat transfer is close to that of forced convective heat transfer in UHF-dusts. The local Nusselt number of Variable Property Solutions can be well correlated by the usual correction method used for forced convective heat transfer in duct. The difference in the heat transfer characteristics of UHF-ducts between CPS and VPS in not so large as those of Uniform Wall Temperature ducts.
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Tetsuo FUJIMOTO, Seizo KATO, Kohsuke SHOBATAKE
1985 Volume 51 Issue 461 Pages
365-369
Published: January 25, 1985
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The process of translational energy exchange on a ceramic is experimentally studied by the method of argon molecular beam. The incident molecules of a translational energy <KE.>
i/k=758 K and of a Mach number 17 impinge on a ceramic surface of temperatures T
s=300∼600 K. The angular distributions of velocity and number flux of molecules scattering from the ceramics are measured by a quadrupole mass spectrometer. The detected time-of-flight spectra agree well with the Maxwall distribution without macroscopic flow velocity. The translational energy of reflected molecules <KE>
γ increases proportionally to T
s and may be expressed by the formula <KE>
γ=C
1<KE>
i + C
2(2kT
S). C
1 ≃ 0.8 and C
2 ≃0.2 at the incident angle θ
i=60°; namely, reflected molecures get their 20% energy from the elastic scattering effect of the incident beat and 80% from the inelastic one on the surface. Their energy accommodation coefficients α lie roughly on 0.8 which agrees with C
2, but α slightly decreases with an increase of T
5.
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Kunio YOSHIKAWA, Shigeharu KABASHIMA, Susumu SHIODA
1985 Volume 51 Issue 461 Pages
370-375
Published: January 25, 1985
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A packed pebble bed regenerative heat exchanger for heating argon by natural gas sired combustion gas was installed and tested. The maximum temperature at the top of the pebble bed was 1850°C and that of argon at the exit of the heat exchanger was 1650°C. The molecular impurity level contained in the heated argon was less than 100 ppm. These results show that the performance of the heat exchanger is satisfactory. One dimensional heat transfer analysis in the pebble bed showed that the changes of temperature distribution in the bed during the heating and the argon blowing periods can be predicted using the known heat transfer coefficients between gas and pebble.
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Shoichiro FUKUSAKO, Makoto TAGO, Yasuhiro YOSHINO, Nobuhiro SEKI
1985 Volume 51 Issue 461 Pages
376-381
Published: January 25, 1985
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This paper is concerned with an experimental study of the freezing heat transfer from a concave wall of a return bend which has a rectangular cross section. The experiments are carried out under the condition that the concave wall is cooled at uniform temperature kept less than freezing temperature of water, while the convex wall is insulated. From this experiment it was found that "Smooth" transition of ice formation on the concave wall tended to take place.
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Masashi OKADA
1985 Volume 51 Issue 461 Pages
382-387
Published: January 25, 1985
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A vertical cylinder embedded in a horizontal plate-like solid initially at its fusion temperature was subjected to a step change in temperature. The resulting melting process with natural convection in the time-dependent melt region was analyzed by means of a finite difference method. The shapes of melting front and the temperatures along the one-half height of the phase-change material (PCM) were measured in the experiments using n-octadecanse as a PCM. The analytical results agreed well with the experimental results. The variations of Nusselt number on the heated cylinder and the dimensionless volume of melt region with Rayleigh number and the dimensionless time were clarified.
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