Theoretical Study for Boiling Heat Transfer in a Confined Space PDF Download
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Author: Aboubakr A. Khalil
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 102
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Author: Aboubakr A. Khalil
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 102
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Author: Chia-Hsiang Hsu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Pool boiling is an effective method used in many technical applications for a long time. Its highly efficient heat transfer performance results from not only the convection effect but also the phase change process in pool boiling. Pool boiling enhancement has been studied in the past decade. However, the mechanisms of pool boiling has not yet been fully understood because of the many parameters that affect its behavior including the latent heat of vaporization, nucleation density, bubble and fluid motion, interaction at the interface, and the physical properties of surface. Among the current studies, bubble departure rate is viewed as one of the dominant factors that affect heat transfer. This research considers the effect of bubble confinement on pool boiling. In the study, confinement was achieved by placing a flat plate over heated surface. The flat plate has a hole in the middle, and there is a gap between the flat plate and the heater. The diameters of hole are 2 mm, 3 mm, and 4 mm; the gap distances are 2.3 mm, 3.6 mm, and 5 mm. The heater consists of an indium-tin-oxide layer deposited on a silicon wafer. An IR camera and high speed cameras are used to acquire the surface temperature distribution and bubble image. By controlling the plate hole size and the gap distance, the effect of confinement on heat transfer performance can be evaluated. Moreover, heat transfer performance of pool boiling with three-2mm-holes plate was investigated and compared with that of single-2mm-hole plate with the smallest gap size. At the lower heat flux values, heat transfer enhancement in confined space was experimentally observed. Surface temperature can be reduced by 4 °C at most. Results indicate that higher bubble departure rate and coalescence effect might be the dominant factor for improving heat transfer performance in a confined space caused by induced shear flow. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152843
Author: Shi-Chune Yao
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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In many equipments, boiling occurs in confined space such as the clearance between the tube and the support plate of steam generators. Corrosive concentration builds up at the boundary of dryout zone and induces severe damage. The knowledge on this kind of boiling phenomena is very limited. It is the objective of this research to understand this fundamental heat transfer of this problem through systematical analysis and experimental studies. This report covers the following aspects of the boiling in confined space: (1) Analysis of single phase forced convection in support plate crevices; (2) Analysis of convective boiling and dryout in support plate crevices; (3) Experiments of boiling and dryout in annular crevices with closed bottom; and (4) Experiments of convective boiling and dryout in annular crevices. (Author).
Author: N. Zuber
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 216
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Author: S. Stephen Papell
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 28
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Author: G. F. Hewitt
Publisher: CRC Press
ISBN: 9781560323341
Category : Technology & Engineering
Languages : en
Pages : 660
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Author: Merouane Khammar
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 214
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Author:
Publisher: Academic Press
ISBN: 0080575749
Category : Science
Languages : en
Pages : 411
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Advances in Heat Transfer
Author: James R. Stone
Publisher:
ISBN:
Category : Boilers
Languages : en
Pages : 44
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Book Description
Experimental data on subcooled and net-quality boiling heat transfer to low pressure water in electrically heated tubes.
Author: N. Zuber
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 80
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Book Description
