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Modeling condensate drops retained o...

ElSherbini, Abdelrahman I.

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Modeling condensate drops retained on the air-side of heat exchangers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Modeling condensate drops retained on the air-side of heat exchangers./
作者:	ElSherbini, Abdelrahman I.
面頁冊數:	125 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1139.
Contained By:	Dissertation Abstracts International64-03B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3086054
ISBN:	9780496338603

Modeling condensate drops retained on the air-side of heat exchangers.
ElSherbini, Abdelrahman I.

Modeling condensate drops retained on the air-side of heat exchangers. - 125 p.

Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1139.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2003.

Water usually condenses on the air-side surfaces of evaporators, causing significant changes to their performance. This research aims at developing a model suitable for predicting the steady-state mass of condensate retained as drops on a heat exchanger. In order to achieve this goal, a thorough understanding of the three-dimensional shapes of drops on inclined surfaces is needed. Analysis, experiments, and computations are used to answer unresolved questions vital to predicting drop shapes for general conditions.

ISBN: 9780496338603Subjects--Topical Terms:

516570
Geology.

Modeling condensate drops retained on the air-side of heat exchangers.
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245 1 0 $a Modeling condensate drops retained on the air-side of heat exchangers.
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500 $a Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1139.
500 $a Adviser: Anthony M. Jacobi.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2003.
520 $a Water usually condenses on the air-side surfaces of evaporators, causing significant changes to their performance. This research aims at developing a model suitable for predicting the steady-state mass of condensate retained as drops on a heat exchanger. In order to achieve this goal, a thorough understanding of the three-dimensional shapes of drops on inclined surfaces is needed. Analysis, experiments, and computations are used to answer unresolved questions vital to predicting drop shapes for general conditions.
520 $a A geometric method is developed to approximate the shape of a drop by fitting two circles to the profile taken at any azimuthal angle. The method, which is validated experimentally, provides an excellent tool for predicting drop volumes and for investigating variables that affect drop shapes. The drop-base is found to take the shape of an ellipse, with the aspect ratio depending on the Bond number. Contact angle variations within drops are determined experimentally, and then defined in terms of the maximum and minimum angles of a drop, which are obtained for general conditions. The results show the maximum contact angle to be approximately equal to the advancing angle of the liquid-surface combination at all conditions. The minimum angle is found to decrease as the Bond number increases. A general relation is observed between the minimum angle of a drop and the Bond number, applicable for different liquids, surfaces, and conditions. An equation is derived relating the advancing contact angle to the receding contact angle and maximum Bond number for any liquid-surface combination. The findings, which are well-supported by data from the literature, help explain and verify some observations of earlier researchers.
520 $a Size distribution functions of drops on inclined surfaces, taken from the literature, are modified to account for different geometric and surface conditions. These distribution functions along with the geometric model of drops and the contact angle results are used to develop a new model of condensate retention. The new model is successful in predicting the mass of condensate retained on coils tested by several other researchers. Preliminary analysis and experiments are presented as a step towards future extensions of the model.
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