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Extra resources for Basics of Fluid Mechanics and Intro to Comput. Fluid Dynamics

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For pin-fin arrays, local a n d average transfer coefficients h a v e b e e n extensively investigated on flat surfaces a n d duct walls for one to several r o w s , in-line or staggered arrays, tip clearance, a n d different u p s t r e a m conditions [20, 67-71]. T h i s study w a s extended to different fin shapes 33 to increase transfer rates, s u c h a s e n d w a l l fillet, oval s h a p e d t u b e , stepped fins, a n d a n n u l a r a n d longitudinally-fined t u b e s [ 2 1 , 22, 72-75].

E. m o l e c u l a r d i f f u s i o n ) effect. e. molecular diffusion) only influences the transfer rate n e a r the wall b o u n d a r y (sublayer) region as mentioned in the previous section. Additionally, the small influence of P r / S c is expected on the a d i a b a t i c / i n a c t i v e ( n o n s u b l i m i n g ) w a l l d u e to zero t e m p e r a t u r e / c o n c e n t r a t i o n gradient at the wall. A n o t h e r r e a s o n for the lower values with 32 m a s s t r a n s f e r m e a s u r e m e n t is the different b o u n d a r y conditions; Z u k a u s k a s a n d Ziugzda [43] report that the average heat transfer coefficient w i t h constant w a l l temperature is a b o u t 15 to 20% l o w e r in flow a r o u n d a circular cylinder t h a n that for the constant heat flux b o u n d a r y condition.

E. molecular diffusion) only influences the transfer rate n e a r the wall b o u n d a r y (sublayer) region as mentioned in the previous section. Additionally, the small influence of P r / S c is expected on the a d i a b a t i c / i n a c t i v e ( n o n s u b l i m i n g ) w a l l d u e to zero t e m p e r a t u r e / c o n c e n t r a t i o n gradient at the wall. A n o t h e r r e a s o n for the lower values with 32 m a s s t r a n s f e r m e a s u r e m e n t is the different b o u n d a r y conditions; Z u k a u s k a s a n d Ziugzda [43] report that the average heat transfer coefficient w i t h constant w a l l temperature is a b o u t 15 to 20% l o w e r in flow a r o u n d a circular cylinder t h a n that for the constant heat flux b o u n d a r y condition.

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