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標題: 具內部熱源的板狀模具之熱傳 計算與表面溫度分佈探討
A Study on the Heat Transfer Characteristic and Surface Temperature Distribution of a Plate Type Mold with Internal Heat Source
作者: 黃炯瑞
Huang, Chiung Jui
關鍵字: Plate Type Mold;板狀模具;Natural Convection;Cylindrical heat source;CFD;自然對流;圓柱熱源;CFD
出版社: 機械工程學系所
引用: [1]林麗清,塑膠射出成形讀本,復文圖書有限公司,1995,台灣省台南市。 [2]莊達人,VLSI製造技術,高立圖書有限公司,2004,台北市。 [3]Eckert,E.R.G.,and E. Soehngen : Interferometric Studies on the Stability and Transition to Turbulence of a Free Convection Layer Boundary,Proc. Gen.Discuss.Heat Transfer ASME-IME,London,1951. [4]Fishenden,M.and Saunders,O.A., “An Introduction to Heat Transfer”, pp.95-97. Oxford University Press, London, 1950. [5]Bosworth,R.L.C.,“Heat Transfer Phenomena”,John Wiley, New York, pp. 102-104.1952. [6]Husar,R.B.and Sparrow, E.M., “Patterns of Free Convection Flow Adjacent to Horizontal Heated Surfaces”, Int. J. Heat Mass Transfer. Vol.11, pp1206-1028, 1968. [7]Z.Rotem,L.Claassen, Natural convection above unconfined horizontal surfaces, J. Fluid Mech. Vol.39, pp.173-192, 1969. [8]Goldstein,R.J.,E.M.Sparrow,and D.C.Jonnes:Natural convection Mass Transfer Adjacent to Horizontal Plate,Int.J.Heat Mass Transfer,vol.16,pp. 1025-1035,1973. [9]Fujji, T.,and H.Imura:Natural Convection Heat Transfer From a Plate with Arbitary Inclination,Int.J.Heat Mass Transfer, Vol.15,p.755,1972. [10]Al-Arabi, M. and El-Riedy, M.K., “Natural Convection Heat Transfer From Isothermal Horizontal Plates of Different Shapes”, Int. J. Heat Mass Transfer. Vol.19,pp.1399-1404, 1976. [11]Yousef, W.W., Tarasuk, J.D., and Mckeen, W.J. ,“Free Convection Heat Transfer From Upward-Facing Isothermal Horizontal Surfaces” ASME J. Heat Transfer. Vol.104, pp.493-500, 1982. [12]Gray,D. D.,and Giorgini,A.,”The validity of Boussinesq approximation for liquids and gases,”Int.J Heat Mass Transfer,Vol.19,pp.545-554,1976. [13]自動控制系統,Benjamin C.Kuo,大中國出版社,1989,台北市。 [14]J. P. Holman, Heat Transfer, 8rd edition, McGRAW-HILL , 2005. [15]Kirk D.Hagen,Heat Transfer with Application , Prentice Hall nternation Inc,2003. [16]Yunus A. Cengel, “Heat Transfer A Practical Approach,” 2rd edition, McGRAW-HILL , 2004. [17]顏月珠,現代統計學,三民書局,1997,台北市。 [18] ,Heat transfer,東南出版社,1987,台北市。 [19]S.V. Patankar, Numerical Heat Transfer and Fluid Flow,Hemisphere Publishing Corporation, 1972. [20]RT Huang, WJ Shen, CC Wang,Orientation Effect on The Natural Convective Performance of Square Pin Fin Heat Sinks, Int. J. Heat Mass Transfer. Vol. 51, pp.2368-2376, 2008. [21]Wang, J.C., H.S. Huang, and S.L. Chen, Experimental Investigations of Thermal Resistance of a Heat Sink with Horizontal Embedded Heat Pipes, International Communications in Heat and Mass Transfer, Vol. 34, pp. 958-970, 2007. [22]白賜清,工業實驗計劃法,中華民國品質學會,2006,台北市。 [23]蘇朝墩,品質工程中華民國品質學會,2002,台北市。 [24]Handbooks of Fluent, Fluent, Inc,2003. [25]John Neter, William Wasserman, and G.A. Whitmore. Applied Statistics 4rd edition. Allyn and Bacon, 1993.
利用計算流體力學軟體Fluent模擬圓柱熱源的板狀模具在於靜止空氣中的自然對流現象探討,並與實驗溫度值比對,結果顯示Fluent與實驗有相同的趨勢。最後,使用田口方法合計7個控制因子,分析各種控制因子對模板溫度均勻化的貢獻度,結果顯示電熱管二邊提高功率、幾何偏心對溫度均勻化貢獻最多,依據田口最佳組合結果溫差3℃, 分析後效果有顯助降低69%溫度標準差。

This study applied several different design parameters(the mold’s position and materials, number of electrical pipes、length and power, the arrangement of power, the insulation materials) to analysis the surface temperature of template and the effect of the heat convection coefficients in order to get the uniform temperature distribution of the template, furthermore, we also studied the phenomenon of nature convection about the template with a cylindrical heat source in a quiescence air.
This study firstly calculate the heat convection coefficient by using zero-dimensional model, and applying the least squares regression method to find out the average heat convection coefficient of both nature and forced part. Then compare these results with experienced equations. By applying the calculated value of heat convection coefficient, this study will compute the time during its heating process to verify the validity of this mathematic model. The mold’s temperature was maintained constant by the control system, because it could not find out the power distribution of the electrical pipes, for the purpose to confirm this power distribution, this study analysis the block shape mold(one dimensional) to verify the temperature distribution curve. Subsequently, it will divide the electrical heating pipe into 3 sections in one dimensional mode, and take the heating power, pipe length as the design parameters and combine the factors of internal energy, conduction, convection, temperature, etc. to establish an one dimensional analysis equation which can be used to calculate the temperature distribution on the different metals. These results could be taken as a basis for the optimal design of the template.
By using the fluid dynamic software “Fluent”, it can be used to simulate the natural heat convection on the template with a cylindrical heat source in a static air, and comparing this result with experimental data, it shows both have the same tendency. Finally, this study will use Taguchi Method with 7 controllable factors to analysis the contribution rate of each controllable factors for uniform temperature distribution on the template. The results show while increasing both of the heating power on the two ends of an electrical heating pipe and the offset can get the better contribution rate. According the simulated results from Taguchi Method, the best combination can decrease the standard deviation value from 2.09 to 0.63 Celsius degree which was obtained by the original experiment, it will have 69% advantage on dropping the standard deviation obviously.
其他識別: U0005-1608201015085300
Appears in Collections:機械工程學系所

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