NDLI: Heat Transfer and Pressure Drop Experimental Correlations for Air-Water Bubbly Flow

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cui, Wenzhi Li, Longjian Chen, Qinghua Liao, Quan Jen, Tien-Chien
Copyright Year	2005
Abstract	In this work a uniquely designed air-water bubbly flow heat transfer experiment is accomplished to investigate the characteristics of pressure drop of airflow and heat transfer between water and tubes for its potential application in evaporative cooling. The attempts to reduce the pressure drop at the condition of maintaining higher heat transfer coefficient have been done by decreasing the bubble layer thickness though the water pump circulation. Pressure drops of air passing through the sieve plate and the bubbling layer are measured for different heights of bubble layer, hole area ratio of the sieve plate and the air velocity through the holes. Experimental data show that the increase of bubble layer height and air velocity both make the pressure drop larger while the effect of the hole area ratio of the sieve plate is relatively sophisticated. A correlation including the effects of all the tested parameters is proposed, which has a mean absolute deviation of 14.5% to that of the experimental data. Heat transfer coefficients of the water and the outside tube wall are measured and the effect of heating flux is also considered. The results show that even at a considerably lower height of bubbling layer the heat transfer coefficient can exceed 5 kW/m2-K. A heat transfer coefficient correlation with a mean absolute deviation of 9.7% is developed based on the experimental data.
Sponsorship	Heat Transfer Division and Electronic and Photonic Packaging Division
Starting Page	233
Ending Page	238
Page Count	6
File Format	PDF
ISBN	0791847322
DOI	10.1115/HT2005-72843
e-ISBN	0791837629
Volume Number	Heat Transfer: Volume 2
Conference Proceedings	ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
Language	English
Publisher Date	2005-07-17
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Bubbly flow Pressure drop Heat transfer Gas-liquid flow Water
Content Type	Text
Resource Type	Article

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