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TABLE 20.1 VALUES OF C, n, AND L TO Be USED IN THE SIMPLIFIED NATURAL-CONVECTION EXPRESSION FOR AIR, EQUATION (20-24) Geometry Range of application L Vertical planes and cylinders Horizontal cylinders *height 104 < Gr, Pr < 10° 10° < Gr, Pr < 1012 103. < Gr, Pr < 10º 10° < Gr, Pr << 1012 105 < Gr, Pr < 2 × 107 0.27 Į length of side 0.29 0.19 0.27 diameter 0.18 1 Horizontal plates-÷-heated plates facing up or cooled 2 x 107 < Gr, Pr < 3 × 1010 0.22 } plates facing down Cooled plates facing up or 3 × 105 < Gr, Pr < 3 x 1010 0.12 Į length of side heated plates facing down 1 horizontal circular plates: L = 0.9 × D

TABLE 20.1 VALUES OF C, n, AND L TO Be USED IN THE SIMPLIFIED NATURAL-CONVECTION EXPRESSION FOR AIR, EQUATION (20-24) Geometry Range of application L Vertical planes and cylinders Horizontal cylinders *height 104 < Gr, Pr < 10° 10° < Gr, Pr < 1012 103. < Gr, Pr < 10º 10° < Gr, Pr << 1012 105 < Gr, Pr < 2 × 107 0.27 Į length of side 0.29 0.19 0.27 diameter 0.18 1 Horizontal plates-÷-heated plates facing up or cooled 2 x 107 < Gr, Pr < 3 × 1010 0.22 } plates facing down Cooled plates facing up or 3 × 105 < Gr, Pr < 3 x 1010 0.12 Į length of side heated plates facing down 1 horizontal circular plates: L = 0.9 × D

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.70P
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TABLE 20.1 VALUES OF C, n, AND L TO Be USED IN THE SIMPLIFIED NATURAL-CONVECTION EXPRESSION FOR AIR, EQUATION (20-24) Geomery Range of application С и L Vertical planes and cylinders Horizontal cylinders *height 104 < Gr, Pr < 10º 109 < Gr, Pr < 1012 103. < Gr, Pr < 10° 10° < Gr, Pr < 1012 105 < Gr, Pr < 2 × 107 0.27 Į length of side 0.29 0.19 0.27 } diameter 0.18 1 Horizontal plates--heated plates facing up or cooled 2 × 10’ < Gr,, Pr < 3 × 1010 0.22 plates facing down Cooled plates facing up or 3 × 105 < Gr, Pr < 3 x 1010 0.12 Į Jength of side heated plates facing down 1 horizontal circular plates: L = 0.9 × D
Transcribed Image Text:TABLE 20.1 VALUES OF C, n, AND L TO Be USED IN THE SIMPLIFIED NATURAL-CONVECTION EXPRESSION FOR AIR, EQUATION (20-24) Geomery Range of application С и L Vertical planes and cylinders Horizontal cylinders *height 104 < Gr, Pr < 10º 109 < Gr, Pr < 1012 103. < Gr, Pr < 10° 10° < Gr, Pr < 1012 105 < Gr, Pr < 2 × 107 0.27 Į length of side 0.29 0.19 0.27 } diameter 0.18 1 Horizontal plates--heated plates facing up or cooled 2 × 10’ < Gr,, Pr < 3 × 1010 0.22 plates facing down Cooled plates facing up or 3 × 105 < Gr, Pr < 3 x 1010 0.12 Į Jength of side heated plates facing down 1 horizontal circular plates: L = 0.9 × D
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