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http://dx.doi.org/10.3795/KSME-B.2015.39.7.591

An Experimental Study on the Effect of Low Fin Tube Geometry on Pool Boiling of a LiBr Solution  

Kim, Nae-Hyun (Div. of Mechanical System Engineering, Incheon Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.39, no.7, 2015 , pp. 591-598 More about this Journal
Abstract
Pool boiling heat transfer coefficients of a LiBr solution were obtained for seven low fin tubes having different fin pitch and fin height. The test range covered saturation pressure from 7.38kPa to 101.3kPa, heat flux from $20kW/m^2$ to $40 kW/m^2$ and LiBr concentration from 0% to 50%. The optimum fin geometry for the present experimental range turned out to be 26 fpi with 0.18 mm fin height.The advantage of added heat transfer area and the disadvantage of slower bubble growth and departure appear to have yielded an optimum fin pitch. The heat transfer coefficient decreased as saturation pressure decreased and Libr concentration increased. The reason may be attributed to the low saturation pressure, which increased the bubble departure diameter and decreased the bubble departure frequency. As the LiBr concenreation increased, the saturation temperature increased and the mass diffusion rate decreased, which resulted in a reduced heat transfer coefficient. The heat transfer coefficients of the low fin tube were greater than those of the smooth tube. Correlations were developed based on the present data.
Keywords
Heat Transfer Coeffcient; LiBr Solution; Low Fin Tube; Pool Boiling;
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