Theoretical Study for Boiling Heat Transfer in a Confined Space
Author : Aboubakr A. Khalil
Publisher :
Page : 102 pages
File Size : 21,63 MB
Release : 1992
Category : Heat
ISBN :
Author : Aboubakr A. Khalil
Publisher :
Page : 102 pages
File Size : 21,63 MB
Release : 1992
Category : Heat
ISBN :
Author : Chia-Hsiang Hsu
Publisher :
Page : pages
File Size : 34,67 MB
Release : 2015
Category :
ISBN :
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 :
Page : 42 pages
File Size : 31,86 MB
Release : 1980
Category :
ISBN :
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 : G. F. Hewitt
Publisher : CRC Press
Page : 660 pages
File Size : 17,47 MB
Release : 1994
Category : Technology & Engineering
ISBN : 9781560323341
Author : N. Zuber
Publisher :
Page : 216 pages
File Size : 20,60 MB
Release : 1959
Category : Heat
ISBN :
Author :
Publisher : Academic Press
Page : 411 pages
File Size : 13,19 MB
Release : 1990-03-08
Category : Science
ISBN : 0080575749
Advances in Heat Transfer
Author : S. Stephen Papell
Publisher :
Page : 28 pages
File Size : 33,50 MB
Release : 1963
Category : Heat
ISBN :
Author : R.T. Lahey Jr.
Publisher : Elsevier
Page : 629 pages
File Size : 43,86 MB
Release : 2013-10-22
Category : Technology & Engineering
ISBN : 1483291383
This volume covers the modern developments in boiling heat transfer and two-phase flow, and is intended to provide industrial, government and academic researchers with state-of-the-art research findings in the area of multiphase flow and heat transfer technology. Special attention is given to technology transfer, indicating how recent significant results may be used for practical applications. The chapters give detailed technical material that will be useful to engineers and scientists who work in the field of multiphase flow and heat transfer. The authors of all chapters are members of the CMR at Rensselaer, a research centre specializing in the state-of-the-art in multiphase science.
Author : S. Harikrishnan
Publisher : CRC Press
Page : 221 pages
File Size : 11,36 MB
Release : 2022-12-05
Category : Science
ISBN : 1000787656
This book provides detailed information related to nanofluids, synthesis and preparation, morphologies of nanoparticles, selection of base fluids and thermophysical properties of nanofluids. The advantage of various conduits, the improvement of the heat transfer performance of phase change materials (PCMs), and the base PCMs for diverse applications are also discussed. Crucial difficulties like stability, aggregation, and clogging of nanoparticles are detailed including factors like the size, shape, and motion of nanoparticles that influence the heat transfer performance of nanofluids. Challenges, applications, and scope of the future works in the subject area are included. Features: Covers heat transfer techniques in utilization of base fluids application of phase change materials (PCMs) Describes preparation and characterization of nanofluids and nano-based PCMs Explains how nanoscience can be utilized in heat transfer studies Reviews conventional heat transfer fluids This volume is aimed at graduate students and researchers in thermal engineering, heat transfer, material science and engineering, and heat transfer enhancement.
Author : Ephraim M. Sparrow
Publisher : Academic Press
Page : 360 pages
File Size : 17,81 MB
Release : 2013-11-19
Category : Science
ISBN : 0124079326
Advances in Heat Transfer fills the information gap between regularly scheduled journals and university-level textbooks by providing in-depth review articles over a broader scope than in journals or texts. The articles, which serve as a broad review for experts in the field, will also be of great interest to non-specialists who need to keep up-to-date with the results of the latest research. This serial is essential reading for all mechanical, chemical and industrial engineers working in the field of heat transfer, graduate schools or industry. - This serial is essential reading for all mechanical, chemical and industrial engineers working in the field of heat transfer, graduate schools or industry