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research-article

PREDICTION OF HEAT TRANSFER DURING SATURATED BOILING IN HELICAL COILS

[+] Author and Article Information
Mirza Mohammed Shah

Fellow ASME, Engineering Research Associates, 10 Dahlia Lane, Redding, CT 06896, USA
Mshah.erc@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4042354 History: Received October 28, 2018; Revised December 10, 2018

Abstract

Heat exchangers with boiling in coils are widely used in the industry. Various researchers have recommended different correlations for heat transfer but there has been no comprehensive comparison of data and correlations to identify the most reliable ones. This was done in the present study. Eight correlations for straight tubes and six for coils were compared with data from 12 studies. The data included four fluids, tube diameters 2.8 to 14.5 mm, coil to tube diameter ratios 12 to 107, reduced pressure 0.0046 - 0.7857, flow rates 80 to 1200 kgm-2s-1, and boiling number 0.16 to 13.6 x 104. None of the correlations for coils were found satisfactory. Four general correlations for straight tubes gave good agreement with the 484 data points, mean absolute deviation being 19.8 to 22.6 %.

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