A Study on Gas–Liquid Film Thicknesses and Heat Transfer Characteristics of Vapor–Gas Condensation Outside a Horizontal TubeSource: Journal of Heat Transfer:;2014:;volume( 136 ):;issue: 002::page 21501DOI: 10.1115/1.4025501Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Noncondensable gases deteriorate heat transfer in the condensation process. It is therefore necessary to study vapor–gas condensation heat transfer process and analyze main factors influencing the process. Based on the doublefilm theory and the Prandtl boundary layer theory, this investigation developed a mathematical model of gas–liquid film thicknesses and local heat transfer coefficient for studying laminar film condensation in the presence of noncondensable gas over a horizontal tube. Induced velocity in the gas film, gas–liquid interfacial shear stress, and pressure gradient were considered in the study. Importantly, gas–liquid film separations were analyzed in depth in this paper. It obtained the distributions of gas–liquid film thicknesses, local heat transfer coefficient, condensate mass flux, and gas–liquid interfacial temperature along the tube surface, and analyzed the influences of bulk velocity, total pressure, bulk mass concentration of noncondensable gas and wall temperature on them, providing a theoretical guidance for understanding and enhancing vapor–gas condensation heat transfer. Gas film thickness and gas–liquid film separations have certain effects on vapor–gas condensation heat transfer. The average dimensionless heat transfer coefficients are in agreement with the data from related literatures.
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contributor author | Li, Huijun | |
contributor author | Peng, Wenping | |
date accessioned | 2017-05-09T01:09:11Z | |
date available | 2017-05-09T01:09:11Z | |
date issued | 2014 | |
identifier issn | 0022-1481 | |
identifier other | ht_136_02_021501.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/155188 | |
description abstract | Noncondensable gases deteriorate heat transfer in the condensation process. It is therefore necessary to study vapor–gas condensation heat transfer process and analyze main factors influencing the process. Based on the doublefilm theory and the Prandtl boundary layer theory, this investigation developed a mathematical model of gas–liquid film thicknesses and local heat transfer coefficient for studying laminar film condensation in the presence of noncondensable gas over a horizontal tube. Induced velocity in the gas film, gas–liquid interfacial shear stress, and pressure gradient were considered in the study. Importantly, gas–liquid film separations were analyzed in depth in this paper. It obtained the distributions of gas–liquid film thicknesses, local heat transfer coefficient, condensate mass flux, and gas–liquid interfacial temperature along the tube surface, and analyzed the influences of bulk velocity, total pressure, bulk mass concentration of noncondensable gas and wall temperature on them, providing a theoretical guidance for understanding and enhancing vapor–gas condensation heat transfer. Gas film thickness and gas–liquid film separations have certain effects on vapor–gas condensation heat transfer. The average dimensionless heat transfer coefficients are in agreement with the data from related literatures. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | A Study on Gas–Liquid Film Thicknesses and Heat Transfer Characteristics of Vapor–Gas Condensation Outside a Horizontal Tube | |
type | Journal Paper | |
journal volume | 136 | |
journal issue | 2 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4025501 | |
journal fristpage | 21501 | |
journal lastpage | 21501 | |
identifier eissn | 1528-8943 | |
tree | Journal of Heat Transfer:;2014:;volume( 136 ):;issue: 002 | |
contenttype | Fulltext |