Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/91417
標題: Computer Analysis of Heat Transfer Enhancement due to Ring-Type Ribs in Circular Tubes.
圓管內部突出環節對熱傳增強之模擬分析
作者: 蔡維屏
TSAI WEI PING
關鍵字: computational fluid dynamics
heat transfer enhancement
ring-type protrusion
Nusselt number
friction factor
計算流體力學
熱傳增強
突出環節
紐塞數
摩擦因子
引用: 參考文獻 [1] S.B. Uttarwar and M.R. Rao, 'Augmentation of Laminar Flow Heat Transfer in Tubes by Means of Wire Coil Inserts', J. Heat Transfer, Vo1. 107, pp. 930-935, 1985. [2] X.H Tan, D.S. Zhu, G.Y Zhou and L.D Zeng, 'Experimental and Numerical Study of Convective Heat Transfer and Fluid Flowin Twisted Oval Tubes', Int. J. Heat Mass Transfer, Vo1. 55, pp. 4701-4710, 2012. [3] E.M. Sparrow, K.K. Koram and M. Charmchi, 'Heat Transfer and Pressure Drop Characteristics Induced by a Slat Blockage in a Circular Tube ', J. Heat Transfer, Vol. 102,pp. 64-70, 1980 . [4] P.Promvonge, Smith Eiamsa-ard,'Heat transfer augmentation in a circular tube using V-nozzle turbulator inserts and snail entry', Exp. Therm. Fluid Sci., Vol. 32, PP. 332–340, 2007. [5] R.L. Webb, E.R. Eckert, and R.J. Goldstein 'Heat Transfer and Friction in Tubes with Repeated-Rib Roughness ', Int. J. Heat Mass Transfer, Vo1. 14, pp. 601-617, 1971. [6] W. Molki and K.L. Bhamidipati, 'Enhancement of Convective Heat Transfer in the Developing Region of Circular Tubes Using Corona Wind', Int. J. Heat Mass Transfer, Vo1. 47, pp. 4301-4314, 2004. [7] D.W . Zhou., 'Heat Transfer Enhancement of Copper Nanofluid with Acoustic Cavitation', Int. J. Heat Mass Transfer, Vo1. 47, pp. 3109-3117, 2004. [8] J.L. Fernandez and R. Poulter, 'Heat Transfer Enhancement by Means of Flag-type Insert in Tubes', Int. J. Heat Mass Transfer, Vo1. 30, pp. 2603-2609, 1987. [9] S.Y. Won and P.M. Ligrani, 'Comparisons of Flow Structure and Local Numbers Numbers in Channels with Parallel-and Crossed-Rib Tabulators', Exp. Therm. Fluid Sci., Vo1. 47, pp. 1573-1586, 2004. [10] 黃文傑, '圓管突出環節對空氣熱傳增強的影響', 國立中興大學機械工程研究所碩士論文, 2004。 [11] 王培堂, '圓管內部連續突出環節對水流與管壁間之熱傳增強的影響',國立中興大學機械工程研究所碩士論文,2005。 [12] A. Garcia, J.P. Solano, P.G. Vicente, A. Viedma, 'The Influence of Artificial Roughness Shape on Heat Transfer Enhancement: Corrugated Tubes, Dimpled Tubes and Wire Coils', Appl. Therm. Eng., Vol. 35,PP. 196-201, 2012 . [13] K.M. Kim, B.S. Kim, D.H, Lee, H. Moon and H.H. Cho, 'Optimal Design of Transverse Ribs in Tubes for Thermal Performance Enhancement', Energy, Vo1. 35, pp. 2400-2406, 2010. [14] T.L. Ngo, Y. Kato, K. Nikitin, T. Ishizuka, 'Heat Transfer and Pressure Drop Correlations of Microchannel Heat Exchangers with S-shaped and Zigzag Fins for Carbon Dioxide Cycles', Exp. Therm. Fluid Sci., Vol. 32, pp. 560-570, 2007. [15] Y-T Yang, C-Z Hwang, 'Calculation of Turbulent Flow and Heat Transfer in a Porous-Baffled Channel', Int. J.Heat Mass Transfer, Vol. 46, pp. 771-780, 2003. [16] W. Qu, I. Mudawar, 'Analysis of Three-Dimensional Heat Transfer in Micro-Channel Heat Sinks', Int. J.Heat Mass Transfer, Vol. 45, pp. 3973-3985, 2002. [17] A. M. Hussein, R. A. Bakar, K. Kadirgama and K. Sharma, Heat Transfer Enhancement with Elliptical Tube under Turbulent flow TiO2-water Nanofluid, Al-Haweeja Institute, Foundation of Technical Educations, IRAQ. [18] F.P. Incorpera, D.P. Dewit, 'Fundamentals of Heat and Mass Transfer',3th ,John Wiley & Sons,1990. [19] Y-T Yang, C-Z Hwang, 'Calculation of Turbulent Flow and Heat Transfer in a Porous-Baffled Channel', Int, J. of Heat Mass Transfer, Vol. 46, pp. 771-780, 2003. [20] J. P. Holman, 'Heat Transfer ', Ninth Edtion, Mc Graw Hill,2002 . [21] B.E. Launder and D. B. Spalding, 'The numerical computation of turbulent flows',Comput. Methods Appl. Mech. Engrg. , Vol.3, PP.269-289,1974. [22] M. Wolfshtein. The Velocity and Temperature Distribution of One-Dimensional Flow with Turbulence Augmentation and Pressure Gradient. Int. J. Heat Mass Transfer, 12:301–318, 1969. [23] S.A. Orszag, V. Yakhot, W.S. Flannery, F. Boysan, D. Choudhury, J. Maruzewski,and B. Patel. Renormalization Group Modeling and Turbulence Simulations. In International Conference on Near-Wall Turbulent Flows, Tempe, Arizona, 1993. [24] 李鵬飛與徐敏義, '精通CFD工程仿真與案例實戰',人民郵電出版社。 [25] Yunus. A. Cengel, 'Heat Transfer ', Mc Graw Hill,1998 .
摘要: ABSTRACT Heat transfer performance of common shell-and-tube heat exchangers is very dependent on the magnitude of the convection heat transfer coefficient of the tubes using in the heat exchanges. This work used computational fluid dynamics (CFD) simulation approach, adopting the Realizable k-ε model in the ANSYS FLUENT commercial software, to investigate the heat transfer enhancement of circular tubes with internal ring-type protrusions. By comparing the simulated result to experimental data reported in the literature, the validity of the CFD appraoch was verified. In this work, eleven sets of heat tranfer data of circular tubes with different ring-type protrusions were presented. The p/d value of the three tubes is 1.45, while the e/d values were 0.043, 0.069 and 0.1 respectively. Among the three sets of data, two were compared with the experimental data. The result (e/d =0.043) shows the error is 17 %, The result (e/d =0.069) shows the error is 3.6 %; Due to lack of experimental data for comparsion, the accuracy of the other one (e/d =0.1) is uncertain . From the three sets of data, the heat transfer characteristics of the heat tranfer enhancing tubes can be qualitatively observed. That is, for a specific tube, when Nu value increases with the Re value; for different tubes, the e/d value increases, both Nu and f values increases. The result also shows that the width of the protrusions has a minor effect on the Nu value.
摘要 一般管殼式熱交換器的性能主要取決於圓管於執行熱交換時的熱對流係數之大小,因此熱傳增強管之應用對管殼式熱交換器性能之提昇有相當之重要性。本文以計算流體力學(CFD)的方式進行流體與熱傳之模擬,研究中使用ANSYS FLUENT軟體,以Realizable k-ε紊流模式對內部具有突出環節之銅管進行模擬分析,藉由比較文獻實驗中得到的數據,以驗證模擬分析之可靠性。最後共完成11組具有突出環節之銅管之熱傳資料,其中p/d值同為1.45,而e/d值則分別為0.043、0.069與0.1,分析結果顯示其中兩組之平均紐塞數與實驗值分別有17 %與3.6 %的誤差,另一組(e/d=0.1)則因無實驗值可作比較,其數據的準確度尚待確認,但從這三組數據中可以定性化的觀察到,對同一支銅管而言, Re值愈大,Nu值則愈大;對不同之銅管而言,e/d值愈高,其整體的Nu值與f值亦會相對變大。研究結果亦顯示,環節軸向寬度對Nu值之影響不大。
URI: http://hdl.handle.net/11455/91417
文章公開時間: 2017-08-31
Appears in Collections:機械工程學系所

文件中的檔案:

取得全文請前往華藝線上圖書館



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.