Measurement of liquid film thickness during passage of bubbles in a vertical rectangular channel

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2910357· OSTI ID:5754290

Monde, M ^[1]

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1. Saga Univ. (Japan)

Heat transfer is markedly enhanced when bubbles generated on a heated surface pass through the narrow space under conditions of bubble or slug flow. In boiling on a horizontal tube bundle the heat transfer is enhanced in a certain range of heat flux by vapor bubbles. It is pointed out by Monde and Nakashima that a remaining liquid film, which is created when a bubble passes through, plays an essential role in heat transfer enhancement. Therefore, knowledge of the liquid film thickness is necessary to elucidate the mechanism of enhancement due to the passing bubbles. The thickness of the liquid film, however, seems to remain unknown except for some special cases; bubbles in a capillary tube, in a vertical tube sealed at one end, and in a vertical tube in which a bubble rises at terminal velocity, transient voiding of a liquid-filled channel, and slug expulsion. The present paper measures the liquid film thickness remaining on the wall when a bubble rises in a vertical rectangular channel.

• OSTI ID: 5754290
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 112:1; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BUBBLES
DIMENSIONS
DUCTS
ENERGY TRANSFER
FILMS
HEAT TRANSFER
MEASURING METHODS
ORIENTATION
THICKNESS