HEAT TRANSFER CHARACTERISTICS WITH IMPINGING SUBMERGED CIRCULAR J ETS OF TRANSFORMER OIL
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1 54 11 Vol Journal of Chemical Industry and Engineering (China) November 2003 (, ) (, ), Re, T K 126 A (2003) HEAT TRANSFER CHARACTERISTICS WITH IMPINGING SUBMERGED CIRCULAR J ETS OF TRANSFORMER OIL LENG Hao, ZHANG Ximin and GUO Liein ( State Key L aboratory of Multiphase Flow in Power Engineering, Xi an Jiaotong University, MA Chongfang Xi an , Shaanxi, China) ( College of Environmental and Energy Engineering, Beiing Polytechnic U niversity, Beiing , China) Abstract The heat transfer characteristics were investigated under impinging submerged circular ets of t ransformer oil1 The factors included recovery effect, Re, nozzle2to2plate spacing, size of nozzles1 Abnormal phenomena were observed from the experimental results of extremely small size ets1 The mechanism behind the results was analyzed in the meantime1 Keywords et impingement, submerged et, heat t ransfer characteristics,,,, 1,, [ 1 ],, 5mm 5mm, Re D = , Corresponding author : Prof GUO Liein E - mail : : :,, 24,, mail1xtu1edu1cn Foundation item : supported by the National Natural Science : (No ) Foundation of China (No ) and the National Science Fund for (No ) Distinguished Young Scholars (No ) Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved Received date :
2 mm018mm110mm11192mm 4 30, Re ; Re : ;, Z/ D : ,, Gardon Cobonque [2 ] (recovery factor) T s r = T aw - u 2 = T aw - T / 2 c p u (1) / 2 c p 0 T s, ; T aw, ; T 0,,, Pr,, T w T w - T aw T w - T s, h = q/ ( T w - T aw ) T aw = T 0 + ( r - 1) u 2 / 2 c p (2), r r 1 (r = 0), Fig12 Variation of Nusselt number with, Pr nozzle2to2plate spacing at low et velocity ( D = 11192mm) 212 Z/ D 2, Re ( Re = 767, 1023), Z/ D N u,,, Z/ D ( Z/ D < 20) N u Fig11 Influence of recovery effect on heat transfer 3, Re ( Re = 2110, 36m s - 1 ), Z/ D N u Z/ D, N u X/ D < 5, N u Z/ D, Re,, [3,4 ] :,, Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved
3 ,, 2110) N u Re ( Re = 1023) Z/ D N u, Re N u ( ), Re N u, 4 N u, [4 ] : 1507 Fig13 Variation of Nusselt number with nozzle2to2plate spacing at high et velocity ( D = 11192mm) [5 ],,,, w Z 2 K = F ( K/ ) X Z 2 m + n - 1 F( K/ ) Re 2 m + n - 1 < - 2, (3), X Z, w = 5 u 5 y y = 0 u (y) - u (0) = lim y 0 y u (y) = lim y 0 y, X, w, (3) w (4), : nozzle2to2plate spacing ( D = 11192mm) Re, X, 214 N u 213 Re, Z/ D, Re, N u, [ 3, 4 ] Z/ D 12, N u Re ( Re = Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved,, Re = 2110 Re N u X/ D = 1126,,,, Re,,,, Re, Fig14 Variation of N u with Re at large, h (W m - 2 K - 1 ), 5,,,
4 = , Fig15 Variation of heat transfer coefficient with size of nozzles, [ 7 ] FC (Meso2scale) X/ D = 2 2, 2, Re Z/ D Z/ D Re, Z/ D Re ( Pr ) X/ D = 015 1,, Re [ 8 ] D = 015mm,, (11000m), [6 ], [9 ] Re k2, D = 015mm, Z/ D = 2 4 6, Re ( Re = 1560) N u, N u X/ D = 015 ( X/ D = 015 ),, 6 (a) Z/ D ( Z/ D = 8),, 6 (b), [ 6 ] (4 ) 1 X/ D = 015,, ; 2 X/ D, [ 10 ], X/ D = p 5 r,,, 1 Re Z/ D, X/ D = 015,, 3 Fig16 Abnormal phenomena with extremely small size et ( D = 015mm), Re Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved
5 54 11 : 1509, ; X/ D = 015, c p, J kg - 1 D, mm K - 1 h, W m - 2 K N u Nusselt Pr Prandtl q, W m - 2 K - 1 Re Reynolds ( Re = ud/ ) r T aw, T 0, T s, u, m X, mm s - 1 Z, mm, m 2 s - 1, kg m - 3 w, N m - 2 Reference s 1 Leng Hao ( ), Zhang Ximin ( ), Guo Liein ( ), Ma Chongfang ( ) An Experimental Study on Recovery Effect of Impinging Circular Jets of Transformer Oil with Larger Reynolds Number J1 Eng1 Thermophysics ( ), 2002, 23 (Suppl ) : Gardon R, Cobonque J1 Heat Transfer Between a Flat Plate and Jets of Air Impinging on It In : Int1 Development in Heat Transfer Proc1 of the 2nd Int1 Heat Transfer Conference New York : ASME, Ma Chongfang, Zheng Qing, Ko S Y1Local Heat Transfer and Recovery Factor with Impinging Free2surface Circular Jets of Transformer Oil Int1 J1 Heat Mass Transf er, 1997, 40 (18) : Ma Chongfang, Zheng Qing, Gomi T1 Impingement Heat Transfer and Recovery Effect with Submerged Jets of Large Prandtl Number Liquid Unconfined Circular Jets Int1J1 Heat Mass Transf er, 1997, 40 (6) : Dong Zhiyong ( ) Impinging Jet ( ) Beiing : Ocean Press, Robert Gardon, Cahit Akfirat J The Role of Turbulence in Determining the Heat2transfer Characteristics of Impinging Jet Int1J1 Heat Mass Transf er, 1965, 8 : Qin Man ( ), Zheng Qing ( ), Ma Chongfang ( ), Lei Daoheng ( ) Experimental Studies of Local Characteristics of Heat Transfer from a Simulated Microelectronic Chip to an Impinging Circular Dielectric Liquid Jet1 J1 Eng1 Thermophysics ( ), 1996, 17 ( 1 ) : Lee X C, Ma C F Numerical Study of Recovery Effect and Impingement Heat Transfer with Submerged Circular Jets of Large Prandtl Number Liquid Int1J1 Heat Mass Transf er, 1997, 40 (11) : Li Deyu ( ) The Interaction Between Fluid Flow and Thermal Process in Recirculating Flow and Jet Impingement : [ dissertation] ( ) Beiing : Tsinghua University, Zhou Dingwei ( ) Single Phase Convection and Boiling Heat Transfer with Impinging Circular Jet of Highly2wetting Liquid: [ dissertation ] ( ) Xi an : Xi an Jiaotong University, Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved
IN FL U ENCES OF SU RFACTAN T ON FRICTIONAL PRESSU RE DROP IN GAS2L IQU ID FLOW
55 5 Vol155 5 2004 5 Journal of Chemical Industry and Engineering (China) May 2004 (, 100022) (, 30167, ) 95 % (SDS), 100 mg kg - 1, 8313 % 8312 3112 % O 35911 A 0438-1157 (2004) 05-0727 - 05 IN FL U ENCES
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