Experimental Investigation of Laminar Heat Transfer Inside Trapezoidal Duct Having Different Corner Angles

In this study, steady-state laminar forced flow and heat transfer in a horizontal smooth trapezoidal duct having different corner angles were experimentally investigated in the Reynolds number range from 102 to 103. Flow is hydrodynamically fully developed and thermally developing under a uniform surface temperature condition. Based on the present experimental data of laminar flow in the thermal entrance region, new engineering correlations were presented for the heat transfer and friction coefficients for each corner angle. The results have shown that as the Reynolds number increases heat transfer coefficient increases but Darcy friction factor decreases. Also, it is observed that average Nusselt number increases while average Darcy friction factor decreases with increasing corner angle of the duct.

[1]  M. Yovanovich,et al.  Laminar Forced Convection Heat Transfer in the Combined Entry Region of Non-Circular Ducts , 2004 .

[2]  J. P. Holman,et al.  Experimental methods for engineers , 1971 .

[3]  R. Siegel,et al.  Laminar forced convection in rectangular channels with unequal heat addition on adjacent sides , 1964 .

[4]  C. Leung,et al.  Forced-convective turbulent-flows through horizontal ducts with isosceles-triangular internal cross-sections , 1997 .

[5]  L. T. Yeh,et al.  Thermally developing convection from Newtonian flow in rectangular ducts with uniform heating , 1993 .

[6]  R. P. Benedict,et al.  Fundamentals of temperature, pressure, and flow measurements , 1977 .

[7]  Bengt Sundén,et al.  Three-dimensional laminar flow and heat transfer in the entrance region of trapezoidal ducts , 1991 .

[8]  P. Mendes,et al.  Heat transfer to non-Newtonian fluids in laminar flow through rectangular ducts , 1996 .

[9]  Bengt Sundén,et al.  Numerical analysis of a primary surface trapezoidal cross wavy duct , 2000 .

[10]  T. T. Wong,et al.  FORCED-CONVECTION AUGMENTATION OF TURBULENT FLOW IN A TRIANGULAR DUCT WITH ARTIFICIALLY ROUGHENED INTERNAL SURFACES , 2002 .

[11]  R. Shah.  Laminar flow friction and forced convection heat transfer in ducts of arbitrary geometry , 1975 .

[12]  R. Shah,et al.  Handbook of single-phase convective heat transfer , 1987 .

[13]  J. Whitelaw,et al.  Convective heat and mass transfer , 1966 .

[14]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[15]  C. Leung,et al.  EFFECTS OF SURFACE ROUGHNESS ON FORCED CONVECTION AND FRICTION IN TRIANGULAR DUCTS , 1998 .

[16]  Renato Machado Cotta,et al.  Thermally developing laminar flow inside rectangular ducts , 1990 .

[17]  R. Shah.  Laminar Flow Forced convection in ducts , 1978 .

[18]  Klaus Gersten,et al.  Boundary-Layer Theory - 8th Revised and Enlarged Edition , 2000 .

[19]  Ephraim M Sparrow,et al.  Experiments on hydrodynamically developing flow in rectangular ducts , 1970 .

[20]  M. Renksizbulut,et al.  Laminar Flow and Heat Transfer in the Entrance Region of Trapezoidal Channels With Constant Wall Temperature , 2006 .

[21]  S. Kakaç,et al.  Heat Exchangers: Selection, Rating, and Thermal Design , 1997 .

[22]  C. Leung,et al.  Forced convection and friction in triangular duct with uniformly spaced square ribs on inner surfaces , 2001 .

[23]  M. Ünsal,et al.  A numerical study of laminar heat convection in ducts of irregular cross-sections , 1997 .

[24]  Li-Zhi Zhang.  Thermally Developing Forced Convection and Heat Transfer in Rectangular Plate-Fin Passages Under Uniform Plate Temperature , 2007 .

[25]  Jer‐Huan Jang,et al.  Mixed convection heat transfer in horizontal rectangular ducts with radiation effects , 2007 .

[26]  C. Leung,et al.  Forced convection of turbulent flow in triangular ducts with different angles and surface roughnesses , 1998 .

[27]  R. M. Manglik,et al.  Fully developed forced convection through trapezoidal and hexagonal ducts , 1999 .

[28]  A. Abdel-azim.  Fundamentals of Heat and Mass Transfer , 2011 .

[29]  M. Sharif,et al.  Laminar mixed convection in shallow inclined driven cavities with hot moving lid on top and cooled from bottom , 2007 .

[30]  E M Sparrow,et al.  Analysis of laminar forced-convection heat transfer in entrance region of flat rectangular ducts , 1955 .

[31]  Y. Çengel.  Heat Transfer: A Practical Approach , 1997 .