ie9b07044_si_001.pdf (197.25 kB)
Heat Transfer and Fluid Flow Characteristics for Newtonian and Non-Newtonian Fluids in a Tube-in-Tube Helical Coil Heat Exchanger
journal contribution
posted on 2020-02-24, 21:29 authored by Naveen Kushwaha, Tara Chand Kumawat, Krishna Deo Prasad Nigam, Vimal KumarIn
the present work, heat transfer and fluid flow characteristics
for both Newtonian and non-Newtonian fluids in tube-in-tube helical
coil (TTHC) heat exchangers have been investigated numerically. The
various TTHC heat exchanger configurations studied are (1) parallel
and (2) counter flow, with and without baffles. The power law index
(n) and Dean number (NDe) are varied from 0.5 to 1.25 and 50 to 500, respectively.
Further, two different models have been proposed to predict the friction
factor (f) and Nusselt number (Nu) in TTHC. It is observed that f and Nu in the TTHC heat exchanger with baffles in the annulus is higher
as compared to without baffles. Furthermore, at low Prandtl number
the baffles have significant influence on heat transfer, while at
high Prandtl number flow configuration has high significance.