Transactions of the Japan Society of Mechanical Engineers

General Survey of Japanese Eisheries Machinery

Kazuo TANAKA

1957 Volume 23 Issue 133 Pages 615-616
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.615

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A Consideration on the Labyrinth Packing of Straight Through Type

Kazunari KOMOTORI

1957 Volume 23 Issue 133 Pages 617-623
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.617

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Some theoretical researches on the labyrinth packing which have been reported are usually on the ideal case. But in actuality these theories cannot be applied especially to the straight through type, because the effects of "carry over" are ignored. So J. Jerie introduced a simple theory on the labyrinth packing, in which the problem of "carry over" was taken into account However, there was a serious mistake in it, so it was corrected in this paper, theoretically introducing the more reasonable relations among the leakage, pitch of the throttling fins, clearance and the number of throttling fins. The results of this theory were compared with our experimental results and it was ascertained that they were in good agreement with the experiment. Moreover, by developing this theory, our experimental results, in which the leakage loss took the smallest value when the pockets were shallow rectangu1ar grooves, could be explained.

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Study on the Venturi Scrubber (2nd Report) : On the Pressure Drop at Throat

Yutaka UEOKA

1957 Volume 23 Issue 133 Pages 623-628
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.623

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The Venturi scrubber is being used successfully for the removal of micron and submicron particle matter, both in solid or liquid state, from gas stream. From a practical stand point the most important item to be considered in the operation of the venturi scrubber is the amount of power required by the over-all pressure drop across the unit. A scrubbing liquid is introduced at the throat at zero velocity in the direction or gas flow. The work done in accelerating and atomizing this liquid is reflected in pressure drop. In the present paper, the pressure drop at the throat of venturi scrubber has been studied theoretically and experimentally. The additional pressure drop owing to the liquid injection is proportional to the ratio of liquid to gas and to the square of gas velocity at throat. The acceleration of sprayed particle has almost accomphished its function within a distance of about 20 cm from the injecting point.

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Study on Surging of Blower (3rd report)

Shigeru TSUJI

1957 Volume 23 Issue 133 Pages 628-633
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.628

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In the 2nd report we showed a method for non-surgings of blowers by "the two-valve operation" on the delivery pipe line. In this paper we show the theoretical and experimental studies on stability or blowers, where the eliminating valve of surging is installed in the suction pipe line or close to the delivery port of blower. As the result or this experiment, it is cleared that this operating method is more useful and effective on the following points than the one mentioned before : 1. Valve loss for eliminating surging is small. 2. Both apparatus and operation are simple. 3. Method is of high stability.

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The Performance of Hydrocyclone Cyclone as a Collecting Unit

Toshiharu FUJIMOTO

1957 Volume 23 Issue 133 Pages 633-640
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.633

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From the probable viewpoint that the collection characteristics will depend upon the design of the unit and the operating conditions, performance tests were carried out using an experimental unit at Resources Research Institute, Agency of Industrial Science and Technology. This paper gives the results of the work, including some suggestions with respect to the collection efficiency. The influences of the following factors upon the collection efficiency η_e were investigated : (1) Feed inlet velocity ν_i, (2) Diameter of overflow finder D_o, underflow nozzle D_u and cylindrical portion D, (3) Dimension of inlet nozzle √(bh), (4) Effective height of cyclone H_e, (5) Inserted length of overflow finder S, (6) Types of feeding, (7) Pulp density δ_f and particle size d of feed slurries. In addition to the above results, the author has shown the following two theoretical formulas : (1) Critical feed inlet velocity corresponding to the maximum collection efficiency η_e(max) may be expressed as Eq (4·4), (2) Collection efficiency η_e may be expressed as Eq. (4·7).

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On the Separating Ability of Cyclone Separator (1st Report)

Tomosada JOTAKI

1957 Volume 23 Issue 133 Pages 640-645
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.640

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Here is the separating velocity of cyclone separator investigated on the experimental data and theoretical equations. The equations of particle motion in cyclone separator are based on many suppositions. As some of them differ from the actual phenomena, the path of particles derived from the above equations are not consistent with experimental traces. There are radial acceleration and inwared flow which are neglected in general as operation is considered to be instantaneous, but in experiment, separating time is in the same order with them. Accordingly, these theoretical suppositions have to be restricted to make them consistent with actual data. And by this restriction, the above equations which stand on centrifugal force and air resistance approach more to the fact. But in general, the motions of particles in vortex flow are represented by the non-linear differential equation. And their solutions by means or power series or "analogue computer" have satisfied experimental particle motions.

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On the Abrasion of the Metallic Flat Plate due to the Fluid containing Sand Particles

Sadaji YAMASHITA

1957 Volume 23 Issue 133 Pages 646-652
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.646

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The auther has once reported on the influence of the static pressure and velocity of fluid containing sand particles inflicted upon the abrasion of the pelton wheel's backets, which consistute the curved wall. In the present report the auther sums up his experimental results of the influences of the velocity of fluid independently inflicted upon the abrasion of the metallic plate-rather short one, medium one and rather long one-placed in parrallel with the flowing direction of the fluid containing sand particles. The experimental result is in summary as follow : - The total abrasion loss is in proportion with 2.2 powers of the velocity of fluid and with 3.2 powers of Reynold's Number for fluid, and the longer the plate is, the smaller the abrasion loss per unit area ; the distribution of abrasion is not uniform, and comparing with the former test result it was disclosed that the abrasion of the flat plate was smaller than that of the curved surface wall.

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On the Influence of the Sand Particles contained in the Fluid on the Abrasion of the Metallic Materials

Sadaji YAMASHITA

1957 Volume 23 Issue 133 Pages 652-658
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.652

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The auther had described up to his reports on the mechanism of the abrasion of metals due to the fluid with sand particles. This report deals with his study on the influence of the sand particles, i.e. the variation of per-centage, the size (grain-dia.) and the shape of the sand particles, mixed in the fluid both when the fluid with sand particles flows in parallel with the metallic plate within the pipe and when the jet with sand particles blown out of the constant head strikes against the metallic plate.

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Performance of Oil Rings (1st report)

Sigezo IWANAMI, Hirosi KATO

1957 Volume 23 Issue 133 Pages 659-665
Published: September 25, 1957
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.23.659

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We have carried out a series of experiments to find out the amount of liquid supplied by an oil ring. Two kinds of rings with trapezoidal cross section, 1.025 cm and 0.696 cm in the equivalent diameter d, have been used for the experiments, where d=wetted perimeter/π. The results are : (1) When the submerged depth exceeds a certain critical value, the total oil-carrying capacity is independent of the submerged depth and the diameter of rings.(2) And also the total oil-carrying capacity depends on the kinematic viscosity of liquid, the equivalent diameter of rings, the velocity of rings and the acceleration of gravity. (eq. 12)(3) The critical submerged depth is determined by the kinematic viscosity, the inner width of rings and the acceleration of gravity.(eq. 4)(4) We have specified the ratio of the amount of adhering on the inner surface of the rings to the total oil-carrying capacity, (illustrated in Fig. 13)

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