Visual study on flow behavior in an inclined two-phase closed thermosyphon

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Heat Transfer Engineering

DOI:https://doi.org/10.1080/01457639508939845· OSTI ID:94124

Shiraishi, M ^[1]; Terdtoon, P; Murakami, M ^[2]

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1. MITI, Tsukuba, Ibaraki (Japan). Mechanical Engineering Lab.
2. Univ. of Tsukuba, Ibaraki (Japan)

A flow visualization study of the inside flow phenomena of an inclined, two-phase, closed thermosyphon at several angles has been conducted. This article describes the detail of the flow patterns varying with the inclination angle. A thermosyphon with a total length about 930 mm was used, and its evaporator and adiabatic sections were provided with 13-mm.-I.D. glass tubing for flow visualization. Freon 113 was charged as the working fluid. Observation of flow phenomena was done at selected inclination angles, such as 90, 80, 70, 60, 55, 45, 35, 20, and 5{degree}. Flow phenomena were recorded with a standard video camera and a still camera, sand the corresponding heat transfer rate was also measured. It was found that the typical flow patterns at several angles are classified by inclination angle, such as an annular flow at vertical or very near the vertical position, and a stratified flow at other angles. Moreover, in the case of a stratified flow, the occurrence of dryout on the evaporator wall is caused by the depletion of working fluid in the evaporator section as a result of the development of the interfacial liquid wave.

• Sponsoring Organization: USDOE
• OSTI ID: 94124
• Journal Information: Heat Transfer Engineering, Journal Name: Heat Transfer Engineering Journal Issue: 1 Vol. 16; ISSN 0145-7632; ISSN HTEND2
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FLOW VISUALIZATION
FLUID FLOW
HEAT TRANSFER
THERMOSYPHONS
TWO-PHASE FLOW