22 - 10/20/2010 The Concentric Tube Annulus Fluid flow...

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10/20/2010 1 Internal Flow: Heat Transfer Correlations Chapter 8 Annulus 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 T s,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 = = 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 D i /D o e) Find correct Nu and calculate h f) Find L
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This note was uploaded on 11/17/2010 for the course CHEN 3210 at Colorado.

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22 - 10/20/2010 The Concentric Tube Annulus Fluid flow...

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