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Title of Journal: Heat Mass Transfer

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Abbravation: Heat and Mass Transfer

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Springer-Verlag

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DOI

10.1016/0021-9681(72)90019-7

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1432-1181

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Heat transfer characteristics of rotating triangul

Authors: E Ibrahim M Moawed N S Berbish
Publish Date: 2012/04/07
Volume: 48, Issue: 9, Pages: 1539-1548
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Abstract

An experimental investigation is carried out to study heat transfer characteristics of a rotating triangular thermosyphon using R134a refrigerant as the working fluid The tested thermosyphon is an equilateral triangular tube made from copper material of 11 mm triangular length 2 mm thickness and a total length of 1500 mm The length of the evaporator section is 600 mm adiabatic section is 300 mm and condenser section is 600 mm The effects of the rotational speed filling ratio and the evaporator heat flux on each of the evaporator heat transfer coefficient he condenser heat transfer coefficient hc and the overall effective thermal conductance Ct are studied Experiments are performed with a vertical position of thermosyphon within heat flux ranges from 11 to 23 W/m2 for the three selected filling ratios of 10 30 and 50  of the evaporator section volume The results indicated that the maximum values of the tested heat transfer parameters of the rotational equilateral triangular thermosyphon are obtained at the filling ratio of 30  Also it is found that the heat transfer coefficient of the condensation is increased with increasing the rotational speed The tested heat transfer parameters of the thermosyphon are correlated as a function of the evaporator heat flux and angular velocity

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