Augmentation Heat Transfer in a Circular Tube Using Divergent Nozzle as Insert
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 9
Abstract
Augmentation techniques place a vital role in enhancement of heat transfer. The above techniques are classified as active, passive and compound techniques, In passive techniques insertion of twisted tape, coils, obstructions and conical nozzles etc are placed. In the present work insertion of divergent nozzles inside a plain tube is considered to predict the friction factor and heat transfer coefficient. Now a day’s heat transfer enhancement is a big task without increasing the surface area, To do so different types of inserts are placed inside the tubes like twisted tapes, helical tapes etc. In the present study divergent nozzles are used as inserts placed in a plain tube at different pitch ratios (PR) = 2.0, 4.0, 6.0, 8.0 and 10.0 to enhance the heat transfer in a plain tube. The air is used as working fluid in the range of Reynolds number 9382 to 16921 based on the consideration of different mass flow rates of air (ma)= 25kg/hr, 30kg/hr, 35kg/hr, 40kg/hr and 45kg/hr. Further, the heat transfer enhancement with insertion of divergent nozzle with pitch ratio (PR) = 2 is compared with insertion of twisted tapes of pitch ratio (PR)/twist ratio (TR) =2 in a plain tube.
Authors and Affiliations
K. Gowrisankar, P. S. Kishore
Keywords
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