TY - JOUR TI - Numerical simulation of heat transfer characteristics of taper helical and spiral tube heat exchanger AU - SHARMA, A. AU - RAJORIA, C.S. AU - SHARMA, D. AU - BHAMU, J.P. AU - KUMAR, R. JO - Journal of Thermal Engineering PY - 2021 VL - 7 SP - 1591 EP - 1603 DO - 10.18186/thermal.1025867 ER -