| Title |
Large Eddy Simulation of Heat Transfer Performance Enhancement due to Unsteady Flow in Compound Channels |
| Authors |
홍성호(Seong-Ho Hong) ; 신종근(Jong-Keun Shin) ; 최영돈(Young-Don Choi) |
| Keywords |
간극 ; 복합부수로 ; 난류유동 ; 대형와 수치모사 ; 열전달 ; 맥동유동 ; 비정상유동 ; 난류모형 Gap ; Compound channels ; Turbulent flow ; Large eddy simulation ; Heat transfer ; Flow pulsation ; Unsteady flow ; Turbulent model |
| Abstract |
In the present article, we investigate numerically turbulent flow of air through compound rectangular channels. Large eddy simulation(LES) is employed for unsteady turbulence modeling. LES gives better predictions for the axial mean velocity distribution than those of other turbulent models. Strong large-scale quasi-periodic flow oscillations are observed in most of the geometries investigated. Such large-scale flow oscillations in compound rectangular channels are similar to the quasi-periodic flow pulsation through the gaps between fuel rod bundle in nuclear reactor. It exists in any longitudinal connecting gap between two flow channels. The frequency of this flow oscillation is determined by the geometry of the gap. The large scale cross motions through the rectangular compound channels induce significant heat transfer enhancement of the compound channel flow. |