TY  - EJOU
AU  - Boonloi, Amnart 
AU  - Jedsadaratanachai, Withada 

TI  - THE EFFECTS OF GAP SPACING RATIO ON FLOW STRUCTURE AND  HEAT TRANSFER CHARACTERISTIC FOR THE V-ORIFICE IN THE  SQUARE CHANNEL HEAT EXCHANGER
T2  - Frontiers in Heat and Mass Transfer

PY  - 2019
VL  - 12
IS  - 1
SN  - 2151-8629

AB  - The variations of flow and heat transfer in the square channel heat exchanger inserted with various parameters of V-orifice are investigated 
numerically. The influences of flow directions (V-Downstream and V-Upstream), gap spacing ratios (g/H or GR = 0, 0.05, 0.10, 0.15, 0.20, 0.25 and 
0.30) and blockage ratios (b/H or BR = 0.05, 0.10, 0.15, 0.25 and 0.30) on flow topology and heat transfer behavior are reported. The laminar flow 
regime with the Reynolds number in the range 100 – 2000 is considered. The numerical results are presented in terms of flow and heat transfer 
structure in the heat exchanger channel. The thermal performance assessments in the square channel with V-orifice are also concluded. As the 
numerical results, the gap between the V-orifice and channel walls changes the flow and heat transfer mechanisms in the channel. The gap can reduce 
the friction loss in the channel and also helps to increase the turbulence of the flow. The optimum gap spacing ratio may help to increase the thermal 
performance of the square channel heat exchanger.
KW  - V-orifice; square channel; heat exchanger; thermal performance; gap spacing ratio

DO  - 10.5098/hmt.12.19