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External Forced Convection

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External Forced Convection

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    1. External Forced Convection

    3. Viscosity of Fluid Density of Fluid Velocity Shape and Orientation of Body Drag Force = Friction Drag + Pressure Drag

    5. Drag Force, FD

    17. For cross flow over tube banks (In-line Arrangement, N > 16, and 0.7 < Pr < 500)

    20. The Logarithmic Mean Temperature Difference ?Tln

    21. Pressure drop, ?P between the inlet and the exit of tube bank

    25. The Schematic of the Huskburner

    26. Arrangement of the Tubes in Staggered Tube Banks

    27. Flow Configuration in Cross-flow Heat Exchanger One fluid mixed, on fluid unmixed

    29. The Properties of Air T2 = 50? r = 1.092 kg/m3 Cp = 1.007 kJ/kg? k = 0.02735 W/m? m = 1.963 10-5 kg/m sec Pr = 0.7228

    30. The Specifications of Tube Banks ST = 107 mm SL = 95 mm D = 77 mm SD = (53.52 +952)1/2 = 109 mm L = 1675 mm NL = 11 2 = 22 NT = 16 N = NL NT = 176 2 = 352 A = NpDL = 71.3 2 = 142.6 m2

    31. The Air Flow at First Stage of Heating F1 = 850 CMM A1 = W L = 3.35 m2 V1 = 4.23 m/sec

    32. F2 = 1,100 CMM A2 = W L = 3.35 m2 V2 = 5.47 m/sec

    33. The Heat Transfer at First Stage of Heating

    34. The Heat Transfer at Second Stage of Heating

    35. Pressure Drop

    36. Optimum Thickness of Insulation

    38. Reference Cengel, Yunus A.. 2003. Heat Transfer: A Practical Approach, 2nd Ed., McGraw-Hill Book Company.

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