Heat-transfer characteristics of two-phase thermosiphon heat pipe. Part 1: Boiling heat-transfer correlation in heating section

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Heat Transfer - Japanese Research; (United States)

OSTI ID:6766447

Kaminaga, Fumito; Okamoto, Yoshizo

A correlation for the boiling heat-transfer coefficient in the heating section of a two-phase thermosiphon heat pipe is developed in comparison with experimental data. The experiments were conducted for a vertically oriented thermosiphon pipe using three kinds of working fluid, water, Freon R-113, and ethanol, over a wide pressure range of 0.1 to 20 bar and a fill charge rate of 0.3 to 0.9. The correlation was obtained by modification of Kutateladze's nucleate boiling correlation in terms of an additional two parameters, the density ratio of liquid and vapor and the surface roughness. The correlation is shown to be in good agreement with the experimental data at a system pressure above 1 bar. The experiments also indicate that the adiabatic well temperature is less than the saturation temperature corresponding to the system pressure in the pipe.

• OSTI ID: 6766447
• Journal Information: Heat Transfer - Japanese Research; (United States), Journal Name: Heat Transfer - Japanese Research; (United States) Vol. 23:1; ISSN 0096-0802; ISSN HTJPAU
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CLOSED-CYCLE COOLING SYSTEMS
COOLING SYSTEMS
ENERGY SYSTEMS
ENERGY TRANSFER
FLUID FLOW
HEAT EXCHANGERS
HEAT PIPES
HEAT TRANSFER
TWO-PHASE FLOW