I nternational j ournal of a dvanced
Fig. 6.Description of air flow in a set of pipes
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Fig. 6.Description of air flow in a set of pipes. a – chess-shaped location; b- corridor location
When pipes are chess-shaped located, c=0.41, m=0.65; when it is corridor-shaped located, c=0.26, m=0.65. As a detectable linear dimension, the outer diameter of the pipe is obtained. The number of Re is calculated by the average speed of the liquid or gas in the narrowest part of the collection. The correction coefficient s takes into account the cross-S 1 and longitudinal step of the bundle: For the chess-shaped set ISSN: 2350-0328 I nternational J ournal of A dvanced R esearch in S cience, E ngineering and T echnology Vol. 7, Issue 10 , October 2020
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at s =(S 1 /S 2 ) 1/6 , S 1 /S 2 <2 For the corridor-shaped set at
=1,12, S 1 /S 2 2 The correction factor I takes into account the reduction in heat transfer in the first and second rows of pipes. For the first row of pipes, i =0,7 (chess-shaped set) and i =0,9 (corridor-shaped set); i =1 for the third and subsequent rows.
The average value of the heat transfer coefficient for the whole set of pipes is determined from the following equation:
(3) here i - the average heat transfer coefficient of the I row; F i - the surface of the I row; Z - the number of tubes in the set. [7] 2> Download 0.67 Mb. Do'stlaringiz bilan baham: |
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