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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

FLOW AND HEAT TRANSFER CHARACTERISTICS IN A TWO-PHASE LOOP THERMOSYPHON INSTALLED WITH AN EVAPORATOR WITH THREE HEATED TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC10.1300
pages 467-472

Sinopsis

A two-phase loop thermosyphon transports thermal energy from a heat source to a heat sink by natural convective circulation under a body force field without any external power supply such as a pump. As a result of this, it is thought that this could possibly be applied to a waste heat recovery system and so on. In practical use, the evaporator has several heated tubes and also the heat supplied to each of the heated tubes is not always equal. Therefore, the present study was performed both experimentally and theoretically on the flow and heat transfer characteristics in a two-phase loop thermosyphon installed with an evaporator with three heated tubes as a comparatively simple multi-tube evaporator in the lower part of the loop. The circulation mass flow rate, pressure and temperature distributions along the loop, as well as the heat transfer coefficients in the heated tubes were measured using water, ethanol and benzene as the working fluids. Also, the circulation mass flow rate, distributions of pressure, temperature and void fraction were calculated numerically. As a result, a comparison of the experimental data with the calculated values was in considerably good agreement.