Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/96508
Citations
Scopus Web of ScienceĀ® Altmetric
?
?
Type: Journal article
Title: Subcooled flow boiling heat transfer of ethanol aqueous solutions in vertical annulus space
Author: Sarafraz, M.
Peyghambarzadeh, S.
Vaeli, N.
Citation: Chemical Industry and Chemical Engineering Quarterly, 2012; 18(2):315-327
Publisher: Association of the Chemical Engineers
Issue Date: 2012
ISSN: 1451-9372
2217-7434
Statement of
Responsibility: 
M.M. Sarafraz, S.M. Peyghambarzadeh, N. Vaeli
Abstract: The subcooled flow boiling heat-transfer characteristics of water and ethanol solutions in a vertical annulus have been investigated up to heat flux 132kW/m2. The variations in the effects of heat flux and fluid velocity, and concentration of ethanol on the observed heat-transfer coefficients over a range of ethanol concentrations implied an enhanced contribution of nucleate boiling heat transfer in flow boiling, where both forced convection and nucleate boiling heat transfer occurred. Increasing the ethanol concentration led to a significant deterioration in the observed heat-transfer coefficient because of a mixture effect, that resulted in a local rise in the saturation temperature of ethanol/water solution at the vapor-liquid interface. The reduction in the heat-transfer coefficient with increasing ethanol concentration is also attributed to changes in the fluid properties (for example, viscosity and heat capacity) of tested solutions with different ethanol content. The experimental data were compared with some well-established existing correlations. Results of comparisons indicate existing correlations are unable to obtain the acceptable values. Therefore a modified correlation based on Gnielinski correlation has been proposed that predicts the heat transfer coefficient for ethanol/water solution with uncertainty about 8% that is the least in comparison to other well-known existing correlations.
Keywords: flow boiling
heat transfer
ethanol
water
Gnielinski correlation
bubble generation
Rights: Copyright status unknown
DOI: 10.2298/CICEQ111020008S
Appears in Collections:Aurora harvest 3
Mechanical Engineering publications

Files in This Item:
There are no files associated with this item.


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