%0 Journal Article %T Numerical simulation of heat transfer characteristics of taper helical and spiral tube heat exchanger %A SHARMA, A. %A RAJORIA, C.S. %A SHARMA, D. %A BHAMU, J.P. %A KUMAR, R. %J Journal of Thermal Engineering %D 2021 %V 7 %P 1591-1603 %R 10.18186/thermal.1025867