Please use this identifier to cite or link to this item:
Title: Transient CHF enhancement in high pressure pool boiling on rough surface
Authors: Walunj, A.
Sathyabhama, A.
Issue Date: 2018
Citation: Chemical Engineering and Processing - Process Intensification, 2018, Vol.127, , pp.145-158
Abstract: Experimental investigation of transient pool boiling heat transfer (PBHT) to saturated water from thick, non-lumped 20 mm diameter copper sample is carried at 1 bar, 5 bar and 10 bar pressure. The time constant (?) of exponential heat supply is varied from 1 to 6. The unidirectional scratches are made on the surface to obtain wide range of surface roughness varying from Ra = 0.106 ?m to Ra = 4.03 ?m. The effect of surface roughness, pressure and time constant on transient critical heat flux (CHF) is extensively studied. Transient CHF enhancement for Ra = 4.03 ?m when ? = 1 is found to be 98.88%, 76.55% and 53.21% at pressures P = 1 bar, P = 5 bar and P = 10 bar, respectively, however it is found to be lower by 9.38%, 21.40% and 9.73%, compared to steady state CHF enhancement for Ra = 4.03 ?m, at respective pressures. The Gorenflo correlation is modified by including the additional parameter ? and it predicts the present transient HTC values with mean absolute error (MAE) of 14.91%. The CHF model is developed by considering the effect of capillary wicking in the narrow unidirectional scratches and the bubble angle. This model predicts the present transient CHF values with MAE of 11.89%. � 2018 Elsevier B.V.
URI: 10.1016/j.cep.2018.03.025
Appears in Collections:1. Journal Articles

Files in This Item:
File Description SizeFormat 
Transient CHF enhancement in high pressure pool boiling on rough surface.pdf2.96 MBAdobe PDFThumbnail

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.