RT Journal Article
ID 5d52038862b34622
A1 Khalid, Aayan
A1 Xie, Gongnan
A1 Sunden, Bengt
T1 NUMERICAL SIMULATIONS OF FLOW STRUCTURE AND TURBULENT HEAT TRANSFER IN A SQUARE RIBBED CHANNEL WITH VARYING RIB PITCH RATIO
JF Journal of Enhanced Heat Transfer
JO JEH(T)
YR 2016
FD 2017-03-03
VO 23
IS 2
SP 155
OP 174
K1 extended surface
K1 single-phase flow
K1 structured surface
K1 recirculating flow
K1 passive technique
K1 overall thermal performance
AB In the fast development of advanced gas turbines with increasing output power, the inlet temperature is accordingly increased. Traditional cooling techniques failed to deal with such situations; however, new cooling techniques incorporating ribbed microchannels with higher capability of heat removal are required. In the present research, a square ribbed channel with various rib pitch ratios is designed to regulate the most optimum configuration for augmenting heat transfer rates to diminish pressure drop consequences. The inlet Reynolds number used for the microchannels varies from 20,000 to 160,000. Four different configurations of six continuous ribs are mounted on one wall by varying height and distance between the ribs. By using computational fluid dynamics with the v2f turbulence model and a constant wall heat flux as the boundary condition on the surfaces, temperature field,
local heat transfer, normalized heat transfer, and thermal performance are acquired. The overall performances
of four tested ribbed microchannels are evaluated and compared. Numerical results predict that the use of increasing rib pitch ratio in the same channel (case 3) is an appropriate design for enhancing heat transfer and reducing pressure loss. Although it has a lower friction factor compared to other cases, it gives the best performance of heat transfer enhancement. It is suggested that the ribbed microchannels with varying rib pitch ratio can increase the overall heat transfer performance.
PB Begell House
LK https://www.dl.begellhouse.com/journals/4c8f5faa331b09ea,0ba2b6e657ced85a,5d52038862b34622.html