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JournalISSN: 0096-0802

Heat Transfer - Japanese Research 

Wiley
About: Heat Transfer - Japanese Research is an academic journal published by Wiley. The journal publishes majorly in the area(s): Heat transfer & Mechanics. It has an ISSN identifier of 0096-0802. Over the lifetime, 794 publications have been published receiving 3253 citations.


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TL;DR: In this paper, the results of an experimental investigation relating to heat transfer during evaporation of thin liquid films falling over horizontal tubes were presented, where five heated tubes were arrayed on a vertical plane with a pitch of 50 mm.
Abstract: This paper presents the results of an experimental investigation relating to heat transfer during evaporation of thin liquid films falling over horizontal tubes. Experiments were conducted using 25 mm o.d. copper tubes heated by internal electrical cartridge heaters so that a uniform heat flux was generated on the outside tube surface. Five heated tubes were arrayed on a vertical plane with a pitch of 50 mm. Freon R-11 preheated to the saturation temperature at 0.2 MPa was supplied to the topmost heated tube through feeding tubes. Heat transfer characteristics on each heated tube were clarified in a range of film Reynolds number from 10 to 2000 and the measured data are presented in the form of correlations. Deterioration of heat transfer due to film break down was also considered. © 1999 Scripta Technica, Inc. Heat Trans Jpn Res, 27(8): 609–618, 1998

99 citations

Journal Article
TL;DR: In this article, an experimental study has been performed using two different types of multipass tubes, one with four vertical upward passes attached to a horizontal main pipe and the other with five horizontal passes placed to a vertically oriented main pipe.
Abstract: An experimental study has been performed using two different types of multipass tubes, one with four vertical upward passes attached to a horizontal main pipe and the other with five horizontal passes placed to a vertically oriented main pipe. Passes had 6 mm inside diameter, and the inside diameter of main pipes was 20 mm for the vertical type and 6 mm for the horizontal type. Multipass tubes simulated evaporators for air-conditioning systems, and refrigerant R11 was used as the working fluid. Vapor and liquid flow rates at each pass were measured under various conditions of two-phase mixture at the main pipe inlet, that is, inlet flow rate and quality. Results suggested that measured values of flow distribution ratio presented a marked distinction between the vertical and horizontal types. On the other hand, in spite of different pass orientations, the same data trend that the flow distribution is dominated by the main tube inlet flow condition was observed, and the flow division ratio was estimated in terms of both phase flow rates before the junction. Based on these results, a flow split model was suggested and an attempt for the prediction of flow distribution was made.

52 citations

Journal Article
TL;DR: In this paper, the authors investigated the pattern, pressure drop, and heat transfer for R113 boiling two-phase flow in extremely narrow channels with a thickness of 35-110 [mu]m between horizontal parallel plates.
Abstract: Two-phase flow in an extremely narrow channel appears in several engineering situations. One application is the duplicated heat-exchanger pipe which is suggested as a safety device for liquid metal cooling systems in fast breeder or fusion reactors. Steam bearings are also involved in the field. In this paper, pattern, pressure drop, and heat transfer were investigated for R113 boiling two-phase flow in extremely narrow channels with a thickness of 35-110 [mu]m between horizontal parallel plates. It was clarified from the experiments that the friction multiplier of two-phase flow is well estimated by an empirical correlation proposed for adiabatic systems, and that the heat-transfer coefficient of two-phase flow is 3-20 times as large as that of the liquid single-phase flow. An analytical model based on viscous flow and the effect of the capillary number on the thickness of the liquid film is proposed. It provides an explanation for the frictional pressure drop and the heat-transfer coefficient.

50 citations

Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
2023114
2022236
199838
199731
199641
199551