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Risaburo OBA, Toshiaki IKOHAGI, Keiichi SATO, yukio ITO, Hideto MIYAKU ...
1985 Volume 51 Issue 462 Pages
419-426
Published: February 25, 1985
Released on J-STAGE: March 28, 2008
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Shigeru OSHIMA, Tsuneo ICHIKAWA
1985 Volume 51 Issue 462 Pages
427-435
Published: February 25, 1985
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Manabu IGUCHI, Munekazu OHMI, Fujio AKAO
1985 Volume 51 Issue 462 Pages
436-444
Published: February 25, 1985
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Ichiro SAKATA, Masaru KIYA, Hitoshi NAGAI, Mikio ARIE
1985 Volume 51 Issue 462 Pages
445-451
Published: February 25, 1985
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Motoyuki ITHO, Yutaka YAMADA, Kiyoshi NISHIOKA
1985 Volume 51 Issue 462 Pages
452-460
Published: February 25, 1985
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Yoshio SHIKANO, Masahiro IKEGAWA, Susumu NAKANO
1985 Volume 51 Issue 462 Pages
461-469
Published: February 25, 1985
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Motoo FUJII, Tetsu FUJII, Msaaki INAISHI
1985 Volume 51 Issue 462 Pages
470-478
Published: February 25, 1985
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Yuji TOMITA, Katsuya FUNATSU, Shingo TSUZUKI, Kenji MIYAZAKI
1985 Volume 51 Issue 462 Pages
479-485
Published: February 25, 1985
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Shinichi TASHIRO, Haruo YOSHIKI
1985 Volume 51 Issue 462 Pages
486-493
Published: February 25, 1985
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Tohru FUKANO, Akihiko ITO, Hiroshi ODAWARA, Tessho KURIWAKI, Yasuo TAK ...
1985 Volume 51 Issue 462 Pages
494-502
Published: February 25, 1985
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Tohru FUKANO, Akihiko ITO, Keisuke MIYABE, Yasuuo TAKAMATSU
1985 Volume 51 Issue 462 Pages
503-512
Published: February 25, 1985
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Kiyoshi MINEMURA, Mitsukiyo MURAKAMI, Hidenori KATAGIRI
1985 Volume 51 Issue 462 Pages
513-521
Published: February 25, 1985
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Katsumi AOKI, Yasuaki NAKAYAMA, Hiroaki OHTA
1985 Volume 51 Issue 462 Pages
522-527
Published: February 25, 1985
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Takayoshi MUTO, Kenro TAKAHASHI
1985 Volume 51 Issue 462 Pages
528-535
Published: February 25, 1985
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Kenji YAMAGUCHI, Tsuneo ICHIKAWA
1985 Volume 51 Issue 462 Pages
536-544
Published: February 25, 1985
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Toshiyuki TAKAGI
1985 Volume 51 Issue 462 Pages
545-553
Published: February 25, 1985
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Akira NAKAYAMA, Hitoshi KOYAMA
1985 Volume 51 Issue 462 Pages
554-562
Published: February 25, 1985
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Suguru YOSHIDA, Kaneyasu NISHIKAWA, Hideo MORI, Akira YAMADA, Msaaki O ...
1985 Volume 51 Issue 462 Pages
563-571
Published: February 25, 1985
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Hiroshi HONDA, Shigeru NOZU
1985 Volume 51 Issue 462 Pages
572-581
Published: February 25, 1985
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Shigefumi NISHIO
1985 Volume 51 Issue 462 Pages
582-590
Published: February 25, 1985
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Tamotsu IGARASHI
1985 Volume 51 Issue 462 Pages
591-599
Published: February 25, 1985
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Masanori TAKEUCHI, Naomichi HEYA, Teruo KIMURA
1985 Volume 51 Issue 462 Pages
600-606
Published: February 25, 1985
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Satoshi OKAJIMA, Hiroyuki KANNO, Shuji YAMAGUSHI, Kazuo IINUMA
1985 Volume 51 Issue 462 Pages
607-612
Published: February 25, 1985
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Keiichi NISHIMOTO, Hiroaki KITAMOTO
1985 Volume 51 Issue 462 Pages
613-623
Published: February 25, 1985
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Fumiaki GOTO, Ryoki TAKAHASHI
1985 Volume 51 Issue 462 Pages
624-627
Published: February 25, 1985
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Shigeru OSHIMA, Tsuneo ICHIKAWA
1985 Volume 51 Issue 462 Pages
628-636
Published: February 25, 1985
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The influences of the chamfer length of the valve seat on the flow performance and the cavitation phenomena of a oil hydraulic poppet valve were studied experimentally using the half cut model. It was made clear that the discharge coefficient became largest when the ratio of the chamfer length (S) and the restriction height (h) was a specific value in almost 1≤S/h≤3 in case of diverging flow, and S/h≤1in case of converging flow, when the valve lift X and Reynolds' number R
e were constant. The critical cavitation number Kc also became largest at the same S/h as above. In case of diverging flow having chamfer length S=(1∼2.5)h, the periodic flow turbulence occured at the metering restriction under some pressure conditions. And the unusual sound noise like as whistling occured with the sympathetic vibration of the oil column in the pipe line.
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Kensuke KAWASHIMO, Kiichiro MORIAKWA, Eizi NEMOTO
1985 Volume 51 Issue 462 Pages
637-642
Published: February 25, 1985
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In this paper, a new analytical method for the boundary value problem of the nonlinear unsteady heat conduction with temperature dependent thermal properties is presented. Two non-equilibrium integral functions have been introduced : the function of the thermal conductivity φ
1(ψ) and the function of the heat capacity φ
2(ψ). By setting the integration intervals of these functions to satisfy the relation φ
1(ψ) =φ
2(ψ), the nonlinear heat conduction equation could be linearlized. This method is applicable to the cases such as linear, quadratic and exponential variations of the thermal conductivity and heat capacity.
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Eisyun TAKEGOSHI, Yoshio HIRASAWA, Sadahisa IMURA
1985 Volume 51 Issue 462 Pages
643-649
Published: February 25, 1985
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In the present work, an investigation was made for the heat transport through insulation powder evacuated under high vacuum. Experiments for heat flux in the powder were carried out from the room temperature down to liquefied helium temperature, which enables us to examine the relation between the heat flux and absolute temperature. Furthermore, the general solution of Wang and Tien for total heat transfer for combined radiation and conduction problem was applied to the powder, was compared with the experimental result. We then quantitatively determined the roles of the contribution from both radiation and conduction, the effect of added aluminium powder and extinction coefficient for radiation in the basic heat transfer mechanisms of the powder in the low temperatures.
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Yasushi NIITSU
1985 Volume 51 Issue 462 Pages
650-654
Published: February 25, 1985
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The analysis of high frequency induction heating process was performed for the temperature distribution in tubular specimen, and a method to obtain the uniformity of the temperature distribution was investigated. The distribution of heat-producing by the external current was calculated in the case of infinite tubular conductor wound by a single induction coil. The influences of current frequency, conductivity of the tube and the distance between external current and conductor were discussed. The temperature distribution of tubular specimen was approximately obtained by solving the heat transfer equation with difference calculus. The shape of the heat coil for the uniform temperature distribution was determined on analysed results. With the heat coil thus obtained, the temperature distributions in the tubular specimen were measured. It was shown that the good uniformity in the temperature distribution was obtained.
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Msaaki TAKEUCHI, Yasuo KUROSAKI
1985 Volume 51 Issue 462 Pages
655-662
Published: February 25, 1985
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The electrical double layer at the interface between the hot wire and the electrolytic solution has an electrostatic capacity to sink part of input current. The value of capacitance around the hot wire was decided from the value of transient currents observed between a couple of Pt electrodes dipped in some sorts of electrolytic solutions. By using these values, the behaviour and the amount of leakage from the hot wire were estimated; the faster damps the leakage for the more conductive solution, and the smaller amount for the less conductive solutions, It is found that the leakage is so small part of input current that the transient hot wire method for electrolytic solutions works satisfactorily.
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Yasutaka NAGANO, Mikio HISHIDA, Masato TAGAWA, Yoshihiro TSUDA
1985 Volume 51 Issue 462 Pages
663-669
Published: February 25, 1985
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The balances of velocity and temperature fluctuation energy and of turbulent heat flux have been evaluated in fully developed pipe flow of air. In the wall region, the streamwise component of velocity fluctuations transfers vast amounts of energy to the cross stream components. Except in the near-centerline region, the production and dissipation of temperature fluctuations are very nearly in balance. The production of turbulent heat flux is of the same order of magnitude as the pressure-temperature gradient correlation over most of the pipe section. The production of turbulent quantities pertaining to the turbulent heat transfer is totally dominated by the coherent turbulent structures near the wall. The energy-containing eddies are found to have a scale comparable to that of the coherent structures. The ratio of temperature and velocity dissipation time scales depends significantly on the production mechanism, and thus changes with the distance from the wall.
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Hakaru SAITO, Ikuo TOKURA, Koichi OKADA
1985 Volume 51 Issue 462 Pages
670-673
Published: February 25, 1985
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Experiments have been carried out on the free convection heat transfer from horizontal cylinders in array of staggered arrangements. Average heat transfer coefficients of individual cylinders and whole cylinder arrays were measured in order to clarify dependabilities of those coefficients upon the geometric figures including spacing and off-set distance between two cylinder lines, . Visualization of flow fields around the array has also been tried to explain the heat transfer behavior of cylinders in array. The experiments showed that there exist some optimum values of cylinder spacings and the off-set distances to increase the heat transfer coefficients and that the promoting effect in heat transfer can be expected especially when the array is set between parallel walls.
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Masanori TAKEUCHI, Naomichi HEYA, Teruo KIMURA, Yoshiki TANAKA
1985 Volume 51 Issue 462 Pages
674-680
Published: February 25, 1985
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Natural convection heat transfer from vertically projected body under both conditions of uniform surface heat flux and uniform surface temperature was investigated numerically. The calculations were carried out for air (P
γ=0.7), G
γH from 4.96×10
3 to 8.49×10
7, G
*γH from 3.28×10
4 to 1.22×10
10 and the aspect ratios H/W from 1 to 6 Some examples of the stream lines and the isothermals are presented. The flow profiles are compared with the results of the smoke-injection flow visualization to show good coincidence. Varied aspects of vertex develop above the horizontal upword-facing surface. And the effect on the heat transfer from the horizontal surface significantly. The lowest value of N
uW/G
γ<W>
1/5) appears at G
γH≈ 1×10
6(G
γH≈3×10
7) for any value of H/W if the variation of N
uW/G
γW
1/5) is shown against Grashof number G
γH (G
γH ).
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Teruo KIMURA, Masanori HEYA, Naomichi TAKEUCHI, Takio USUI
1985 Volume 51 Issue 462 Pages
681-687
Published: February 25, 1985
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Natural convection heat transfer within a rectangular enclosure provided with a partition extended from the vertical heated wall was investigated experimentally. The experiments were carried out with water, for Rayleigh number in the range, 2.0×10
7 < R
aw < 3.0 × 10
8, and an aspect ratio H/W=s. The effect of partition on the fluid and temperature fields was investigated by dye-injection flow visualization and by thermocouple probes, respectively. The effect of the partition on the heat transfer across the enclosure was also studied. The slant partition, especially, the downward oriented partition reduces the convective heat transfer in comparison with that of horizontal partition. And only the horizontally projected length of partition, independently of the angle of inclination and the vertically projected length of the slant partition, effects on the Nusselt number N
uw distinctly.
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Kazuo MAENO, Susumu ORIKASA, Akihiro YAMAZAKI, Yutaka HANAOKA
1985 Volume 51 Issue 462 Pages
688-692
Published: February 25, 1985
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Shock tube facilities for low temperature gas have been developed by combining the non-diaphragm shock tube with cooling by liquid nitrogen, and with data processing by microcomputer. The developed shock tube is free pollution by broken diaphragm or freezing influx of atmosphere. Using N
2, R-12, and O
2 as test gases measurements are performed for initial pressures, temperature, velocities of incident and reflected shock waves, and pressure changes. Minimum temperature of test gas of initial condition ranges to 161 K (-112°C) for O
2. Among the measured results, shock waves in R-12 show real gas effect especially and strong condensation phenomena behind the waves are observed near saturation conditions of low temperature.
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Suguru YOSHIDA, Kaneyasu NISHIKAWA, Hiroshi TAKAMASU, Hideo MORI
1985 Volume 51 Issue 462 Pages
693-698
Published: February 25, 1985
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Studies of the post-dryout heat transfer were made based on the experimental data of the heat transfer to Freon 22 flowing upword in vertical, uniformly heated round tubes ( 9and 13 mm ID) for a range of reduced pressure of 0.68 to 0.92, mass velocity of 400 to 1600 kg/(m
2·s) and heat flux of 12 to 70 kW/m
2. The wall temperatures estimated by the use of a conventional, theoretical model agreed qualitatively with those measured, but not quantitatively. A nondimensional parameter Kn was introduced to a model for the post-dryout regime to take account of the thermodynamic nonequilibrium between the vapor and the liquid droplets. A correlation of Kn was obtained, and this correlation, used with the correlation for the heat transfer to the superheated vapor, was successful in predicting
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Kazuo AOKI, Masaru HATTORI, Yoshihide YANAGIHARA
1985 Volume 51 Issue 462 Pages
699-704
Published: February 25, 1985
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There are some characteristics in the heat exchanger with frosting which differ from those in common heat exchangers. In particular, thermal resistance not only increases with growing of a frost layer but also depends on the position of the heat exchanger. In this paper, the characteristics of heat exchanger with frosting have been studied experimentally and theoretically, using a double pipe heat exchanger in parallel flow. Frost properties were connected with the frost growth under the condition where air temperature and humidity change in the direction of air flow. The characteristic analysis of the heat exchanger was presented based on the frost growth under a frost structural model and was good agreement with the experimental results.
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Takeo SAITOH, Koichi HIROSE
1985 Volume 51 Issue 462 Pages
705-711
Published: February 25, 1985
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A high-performance latent heat thermal energy storage (TES) / heat pump system was proposed. The transient thermal characteristics of the latent heat TES / heat pump system were experimentally revealed in detail. And it is shown that the proposed system has high coefficient of performances of 4.2∼5.0 ( Space heating mode). A simulation of the spherical capsule bed for melting process was also done under the assumption that heat conduction is dominant mode. The comparison between simulation results and experiment has shown that the agreement between the two is excellent. The present system eliminates so-called supercooling problem which is especially important for inorganic hydrates, and it also extends the possibility to select change materials.
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Takeyuki KAMIMOTO, Tomonori URUSHIHARA, Yoshihiro MOCHIMARU, Hideo MOR ...
1985 Volume 51 Issue 462 Pages
712-715
Published: February 25, 1985
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The swirl velocity in the combustion bowl of a DI diesel engine was measured by means of the laser droppler velocimetery, varying the swirl intensity and engine speed. At the same time, an axisymmetrical two dimentional laminar model for simulating the incylinder are motion was presented. The boundary condition of the flow near the wall was investigated with a comparison of predicted and measured swirl velocity, and as a result the free slip condition was found to be suitable for the present model. From a comparison between measured and theoretical swirl velocity, it was turned out that the secondary flow in the combustion bowl induced by an interaction between the squish and swirl flow transfers various swirl velocity from various points to a fixed point where a complicated time variation of the swirl velocity is observed.
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Akira NISHI
1985 Volume 51 Issue 462 Pages
716-720
Published: February 25, 1985
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In the previous paper the initial dispersion process of jet engine exhaust plume was discussed with the data of jet engine field test as well as those of the model test. The momentum dominant region in the jet was concerned mainly, and the model test was carried out for a few nozzle heights over the ground board which corresponding to the engine installing height of the aircraft. There are considerable differences of the ratio of inertia to buoyant forces in the jet for the engine operating models, i.e., for takeoff mode (TO) the inertia is dominant, on the contrary the buoyancy is dominant for idling mode (ID). These typical conditions of TO and ID modes were examined and their results are compared with each other and with those of field test. The sources of atmospheric turbulent diffusion after the jet dispersion are estimated by there results.
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Yoshihiko KAWAZOE
1985 Volume 51 Issue 462 Pages
721-724
Published: February 25, 1985
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The authors showed in the previous report that hunting disappears when the suction pressure is substituted for the subventuri pressure which has been used to govern the pump rack displacement. In the present work, he determined experimentally the frequency responses of the engine system and the pneumatic governor system composing a closed loop, respectively, and verified the existence of hunting under the subventuri pressure control and non-existence of it under the suction pressure control. Ito was found that the governed engine using suction pressure dose not hunt with a reduction in phase lag.
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Mitsushige NAKAYAMA, Gorou OGIHARA
1985 Volume 51 Issue 462 Pages
725-729
Published: February 25, 1985
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In order to develop the low NO
x combustion system and high performance steam generator, several tests had been made. The first, to reduce NO
χ emissions, a new type swirl nozzle has been developed. The feature of this nozzle. The second, the combustion tests with package type boiler have been made. From the experimental investigations, NO
χ emission levels emitted from this combustion chamber the grooved swirl nozzle were 30-40 percent less than that of the conventional hollow-cone type swirl nozzle.
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