Effect of Surface Inclination on Filmwise Condensation Heat Transfer During Flow of Steam–Air MixturesSource: Journal of Thermal Science and Engineering Applications:;2020:;volume( 012 ):;issue: 004::page 041028-1Author:Bhanawat, Abhinav
,
Yadav, Mahesh Kumar
,
Punetha, Maneesh
,
Khandekar, Sameer
,
Sharma, Pavan K.
DOI: 10.1115/1.4046867Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Empirical/semi-empirical correlations are available in the literature to quantify the effect of several major parameters, like bulk pressure, non-condensable gas mass fraction, and wall subcooling, on condensation heat transfer coefficient (HTC). However, despite numerous applications of condensation on inclined flat plates, there is a lack of understanding of the effect of surface inclination on condensation heat transfer. Accordingly, a dedicated experimental program was undertaken to investigate the effect of surface inclination angle on filmwise steam condensation. Experiments were performed at different bulk pressures (1.7–4.2 bar absolute) and steam-air mass fractions (ranging from pure steam, i.e., 0% to 40% w/w air), with the steam-air mixture flowing over a flat test plate (Re range, 4200–4800). In each run, the inclination angle of the test surface was varied from −90 deg (condensation underneath the horizontal surface, facing downward) to +90 deg (condensation over the horizontal surface, facing upward) in increments of 15–20 deg (inclination angle θ measured from vertical). The results reveal an intriguing trend: for pure steam condensation, the HTCs decrease as the plate is inclined in either direction from the vertical, and the variation is nearly symmetric for both upward- and downward-facing configurations. On the other hand, for steam condensation in the presence of air, the HTCs decrease monotonically for upward-facing configurations, while they increase slightly (10–20%), and decrease subsequently (for θ < −70 deg) for downward-facing cases. Finally, the HTCs for inclined orientations are compared with the HTC in the standard vertical configuration to quantify the effect of inclination angle.
|
Show full item record
contributor author | Bhanawat, Abhinav | |
contributor author | Yadav, Mahesh Kumar | |
contributor author | Punetha, Maneesh | |
contributor author | Khandekar, Sameer | |
contributor author | Sharma, Pavan K. | |
date accessioned | 2022-02-04T22:20:18Z | |
date available | 2022-02-04T22:20:18Z | |
date copyright | 5/20/2020 12:00:00 AM | |
date issued | 2020 | |
identifier issn | 1948-5085 | |
identifier other | tsea_12_4_041028.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4275369 | |
description abstract | Empirical/semi-empirical correlations are available in the literature to quantify the effect of several major parameters, like bulk pressure, non-condensable gas mass fraction, and wall subcooling, on condensation heat transfer coefficient (HTC). However, despite numerous applications of condensation on inclined flat plates, there is a lack of understanding of the effect of surface inclination on condensation heat transfer. Accordingly, a dedicated experimental program was undertaken to investigate the effect of surface inclination angle on filmwise steam condensation. Experiments were performed at different bulk pressures (1.7–4.2 bar absolute) and steam-air mass fractions (ranging from pure steam, i.e., 0% to 40% w/w air), with the steam-air mixture flowing over a flat test plate (Re range, 4200–4800). In each run, the inclination angle of the test surface was varied from −90 deg (condensation underneath the horizontal surface, facing downward) to +90 deg (condensation over the horizontal surface, facing upward) in increments of 15–20 deg (inclination angle θ measured from vertical). The results reveal an intriguing trend: for pure steam condensation, the HTCs decrease as the plate is inclined in either direction from the vertical, and the variation is nearly symmetric for both upward- and downward-facing configurations. On the other hand, for steam condensation in the presence of air, the HTCs decrease monotonically for upward-facing configurations, while they increase slightly (10–20%), and decrease subsequently (for θ < −70 deg) for downward-facing cases. Finally, the HTCs for inclined orientations are compared with the HTC in the standard vertical configuration to quantify the effect of inclination angle. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Effect of Surface Inclination on Filmwise Condensation Heat Transfer During Flow of Steam–Air Mixtures | |
type | Journal Paper | |
journal volume | 12 | |
journal issue | 4 | |
journal title | Journal of Thermal Science and Engineering Applications | |
identifier doi | 10.1115/1.4046867 | |
journal fristpage | 041028-1 | |
journal lastpage | 041028-13 | |
page | 13 | |
tree | Journal of Thermal Science and Engineering Applications:;2020:;volume( 012 ):;issue: 004 | |
contenttype | Fulltext |