3013-11 Lecture 17 - Flow Across Banks of Tubes

3013-11 Lecture 17 - Flow Across Banks of Tubes - 4...

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CHE 3013 – Fall 11 1 of 8 Smay Lecture 17 Flow Across Banks of Tubes Assignments Hw-7, Due Monday, October 10 Assigned Reading Incropera et al., pp 436-447 Handouts (on D2L unless stated otherwise) None Outline 1. Example 7.1 – Flow over a flat plate 2. Tube banks in cross flow 3. Geometry and definitions 4. Correlations for heat transfer 5. Evaluation of properties 6. Effects of bundle layout on heat transfrer and pressure drop 7. Correlations for pressure drop across banks of tubes Key Concepts 1. Fluid flow in banks of tubes depends on bundle layout. 2. Ther are major differences in flowghrough in-line and staggered layouts. 3. Fluid properties must be evaluated at the same temperatures used to develop the correlations. Key Skills 1. Identify and specify tube bundle geomentry. 2. Calculate heat transfer foefficients for banks of tubes 3. Calculate heat transfer for banks of tubes
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Unformatted text preview: 4. Calculate pressure drop across banks of tubes. CHE 3013 – Fall 11 2 of 8 Smay Example 7.1 CHE 3013 – Fall 11 3 of 8 Smay CHE 3013 – Fall 11 4 of 8 Smay Flow across Banks of Tubes CHE 3013 – Fall 11 5 of 8 Smay Zukauskas correlation 4 1 36 . max , Ο Ο Π Ξ Μ Μ Ν Λ = s m D D Pr Pr Pr CRe Nu (7.64) 8 max , 10 x 2 1000 500 7 . 20 ≤ ≤ ≤ ≤ ≥ D L Re Pr N 20 2 20 ≥ < = L L N D N D Nu C Nu (7.65) CHE 3013 – Fall 11 6 of 8 Smay μ ρ max max , DV Re D = ( ) ( ) Ο Ο Π Ξ Μ Μ Ν Λ − − − − − = Δ o s i s o s i s lm T T T T T T T T T ln (7.66) Ο Ο Π Ξ Μ Μ Ν Λ − = − − p T T i s o s C S VN h DN T T T T π exp (7.67) ( ) lm T D h N q Δ = ' (7.68) CHE 3013 – Fall 11 7 of 8 Smay CHE 3013 – Fall 11 8 of 8 Smay Pressure Drop Ο Ο Π Ξ Μ Μ Ν Λ = Δ 2 2 max V fN p L ρ χ (7.69)...
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3013-11 Lecture 17 - Flow Across Banks of Tubes - 4...

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