Heat Transfer Characteristics of Filmwise and Dropwise Condensation on Vertical Tubes in the Presence of Air: An Experimental Study
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Abstract
Condensers are essential to many industrial processes, such as desalination, refrigeration, and power generation. The condenser performance largely depends on the mode of condensation (filmwise or dropwise) which significantly affects heat transfer rates. In this paper, An experimental investigation has been made on filmwise condensation (FWC) & dropwise condensation (DWC) to determine) the heat flux and heat transfer coefficient (HTC) for three steam temperatures of 100oC, 80oC and 60oC. The results are compared with predicted values. It is observed that HTC of DWC is more than FWC. Experimental calculations of the influence of non-condensable gas (air) on heat flux and HTC have also been done and it was proved that the effect of air (1% and 2%) has a very detrimental effect on both FWC and DWC. The experimental values of HTC in presence of air are compared with predicted values obtained by two latest empirical correlations and deviation is identified in FWC. A satisfactory relation is obtained between actual and predicted values.
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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