RT Journal Article
ID 787797770b88dd28
A1 Hamdan, Mohammad O.
T1 NUMERICAL ANALYSIS OF ENHANCED HEAT TRANSFER IN DEVELOPING LAMINAR PIPE FLOW USING DECAYING SWIRL AT THE INLET
JF Journal of Enhanced Heat Transfer
JO JEH(T)
YR 2016
FD 2017-12-11
VO 23
IS 4
SP 283
OP 298
K1 swirl flow
K1 single-phase forced convection
K1 thermal entrance region
K1 passive enhancement
AB In the present work, laminar forced convection in the developing region of pipe flow with decaying swirl is numerically investigated. A two-dimensional swirl axisymmetric computation region has been modeled with uniform axial velocity and constant angular velocity at the pipe inlet. The effect of the inlet swirl velocity on heat transfer is described mainly through the friction coefficient and the wall Nusselt number. The results show that decaying swirl enhances local heat transfer but at the
cost of increasing pumping pressure. The data shows that as swirl number increases from 0 to 2.5, the maximum local Nusselt number increases from 0% to 40%, while maximum local friction coefficient increases from 0% to 360%. Hence the insertion of a swirl generator in a tube heat exchanger reduces the size of the heat exchanger but it increases pumping system size and cost.
PB Begell House
LK http://dl.begellhouse.com/journals/4c8f5faa331b09ea,6d2eb4574949129a,787797770b88dd28.html