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Effect of Dimple Diameter on Heat Transfer Enhancement of Double Pipe Heat Exchanger Using Dimpled Twisted Tape
[Full Text]
AUTHOR(S)
Sanjay Kumar Singh, Arvind Kumar
KEYWORDS
Twisted tape with dimple insert, DPHE, Nusselt Number, Friction factor, Thermal performance factor
ABSTRACT
The objective of this communication is to carry outnumerical studyof heat transfer and friction factor in a double pipe heat exchanger (DPHE) counter-flowarrangementusing twisted tape with dimple inserts. The study investigated the effects of twisted tapes with dimples insert of different dimple diameters of 3mm,5mm and 7mm at D/H ratio 3. The numerical analysis revealed that the value of Nusselt number was maximum for dimple diameter 5mm and it is 1.37 - 1.46, 1.19 - 1.24 and 1.10 - 1.18 times greater than the twisted tape without dimple,for twisted tape with dimple diameter 3mm and with 7mm respectively. The friction factor was found to be directly proportional to the diameter of the dimple.For tube fitted with twisted tape without dimple,for twisted tape with dimples of diameter 3mm, 5mm and 7mm,the values were 3.34 - 3.63, 3.62 - 4.36, 4.86 - 5.10 and 5.76 - 6.06 times greater than the plain tube. The results emphatically reflected the positive impact of twisted tapes with dimple inserts on heat transfer enhancement in DPHE.
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