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class 22 - Internal Flow Heat Transfer Correlations Chapter...

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Click to edit Master subtitle style 8/13/11 Internal Flow: Heat Transfer Correlations Chapter 8 Annulus
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8/13/11 The Concentric Tube Annulus Fluid flow through region formed by concentric tubes. Convection heat transfer may be from or to inner surface of outer tube and outer surface of inner tube. Surface thermal conditions may be characterized by uniform temperature ( T s,i Ts,o) or uniform heat flux (q”i, q”o ). Convection coefficients are associated with each surface, where ) ( ) ( , " , " m o s o o m i s i i T T h q T T h q - = - =
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8/13/11
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8/13/11 Saturated steam flows through the inner tube maintaining the surface temperature constant (100°C) while the outer surface of the tube is well- insulated. If fully developed conditions may be assumed throughout the annulus, how long must the system be to provide an outlet water temperature of 75°C? Plan: a) Determine governing equation b) Find hydraulic diameter c) Calculate Re and determine flow regime d) Find Di/Do e) Find correct Nu and calculate h f) Find L
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8/13/11 What is the hydraulic diameter?
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