English  |  正體中文  |  简体中文  |  Items with full text/Total items : 43312/67235
Visitors : 2106491      Online Users : 3
RC Version 5.0 © Powered By DSPACE, MIT. Enhanced by NTU/NCHU Library IR team.
National Chung Hsing University Institutional Repository - NCHUIR > 理學院 > 應用數學系所 > 依資料類型分類 > 期刊論文 >  Numerical prediction of turbulent mixed convection in a concentric horizontal rotating annulus with low-Re two-equation models

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/135683

標題: Numerical prediction of turbulent mixed convection in a concentric horizontal rotating annulus with low-Re two-equation models
作者: Char, M.I.;Hsu, Y.H.
賈明益
關鍵字: natural-convection;cylindrical annuli;cylinder
日期: 1998
Issue Date: 2012-12-14 12:05:31 (UTC+8)
關連: International Journal of Heat and Mass Transfer, Volume 41, Issue 12, Page(s) 1633-1643.
摘要: Numerical computations are conducted for turbulent mixed convection of air in a horizontal concentric annulus between a cooled outer cylinder and a heated, rotating, inner cylinder. Time-averaged equations of turbulent fluid motion and heat transfer are solved using the Launder-Shanna low-Re eddy-viscosity two-equation model coupled with the Yap correction and the Kato-Launder modification. Numerical results are obtained for the Rayleigh number, Ra, ranging from 10(7) to 10(10), the Reynolds number, Re, from 0 to 10(5) and the radius ratio, RR, from 2.6 to 10 for a constant Prandtl number of 0.7. The effects of these parameters on the flow and heat transfer characteristics are discussed in detail. Predictions are also compared with published studies of other investigators. A good agreement with the results from the published experimental data and other computations is found. A comprehensively comparative analysis shows that the Kato-Launder modification is an essential ingredient, which can effectively reduce the unrealistic turbulence energy at impingement regions. Therefore, the modification can return more satisfactory prediction for the considered cases, Results show that the mean Nusselt number. Nu, increases with an increase in Ra. but decreases with an increase in Re or RR. When Ra > 10(9), a crucial phenomena, the peak value of local Nusselt number occurring in the vicinity of thermal plume region, is first discovered and discussed. For the centrifugal configurations, it is found that rotation has caused significant reduction in the mean heat transfer and it generally increases the strength of the secondary flows. (C) 1998 Elsevier Science Ltd. All rights reserved.
Relation: International Journal of Heat and Mass Transfer
Appears in Collections:[依資料類型分類] 期刊論文
[依教師分類] 賈明益

loading Web of Knowledge data....

Files in This Item:

File SizeFormat
index.html0KbHTML194View/Open


 


學術資源

著作權聲明

本網站為收錄中興大學學術著作及學術產出,已積極向著作權人取得全文授權,並盡力防止侵害著作權人之權益。如仍發現本網站之數位內容有侵害著作權人權益情事者,請權利人通知本網站維護人員,將盡速為您處理。

本網站之數位內容為國立中興大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用。

聯絡網站維護人員:wyhuang@nchu.edu.tw,04-22840290 # 412。

DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU/NCHU Library IR team Copyright ©   - Feedback