ANALYSIS OF CONVECTIVE HEAT TRANSFER DURING IMMERSION FRYING
作者:
B.E. Farkas,
L.J. Hubbard,
期刊:
Drying Technology
(Taylor Available online 2000)
卷期:
Volume 18,
issue 6
页码: 1269-1285
ISSN:0737-3937
年代: 2000
DOI:10.1080/07373930008917776
出版商: Taylor & Francis Group
关键词: boiling;food dehydration;high temperature drying;moving boundary;porous media
数据来源: Taylor
摘要:
Immersion frying was studied as a high temperature drying process and analogies drawn between periods found in drying and similar periods in immersion frying. Analysis of external heat transfer during immersion frying showed a highly complex system of free and forced convection augmented by boiling conditions. Oil flow was found to be driven downward by buoyancy forces due to cooling at the sample surface then upward due to entrainment in vapor bubbles during boiling conditions. Experimental work showed the convective heat transfer coefficient to be a dynamic property ranging from 300 to 1100 W/m2°C and to be strongly coupled with bulk movement of the oil. Heat flux measurements found a peak flux of nearly 30,000 W/m3. Based on analysis of bubble dynamics it is hypothesized that heat flux increases with increased oil degradation through a reduction in vapor bubble size and increase in bubble frequency due to changes in interfacial properties of the oil.
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