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열전달 향상 장치를 삽입한 평판형 태양열 집열기의 열전달 특성과 압력강하에 관한 수치해석
허주녕(Joonyoung Heo),김지훈(Jihoon Kim),신지영(Jeeyoung Shin),손영석(Young-Seok Son) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Heat transfer and pressure drop characteristics of a flat-plate solar collector have long been investigated since they were widely used. The use of artificial roughness in different forms, shapes and sizes is the most common and effective way to improve the performance of a solar collector. In the present study, numerical analysis was performed on heat transfer and pressure drop in a rectangular channel with rib arrays. The uniform heat flux is applied to the channel from the upper side. The forms of ribs considered in this study were rectangular rib, rib with groove, and baffle. The ribs were deployed transverse or aligned 60° to the main direction of the flow. Air is the working fluid with the flow rate in terms of Reynolds numbers ranging from 3200 to 17800. Nusselt number and friction factor were investigated to predict the performance of the system with various type of roughness geometry. The average Nusselt number and pressure drop were increased with the increase of velocity. The highest heat transfer occurred for the rib with groove which was aligned 60° to the main flow direction.
립이 설치된 수평채널의 압력강하 및 열전달 특성에 관한 수치해석
김지훈(Jihoon Kim),허주녕(Joonyoung Heo),손영석(Young-Seok Son),신지영(Jeeyoung Shin) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In this study, simulations of turbulent flow and heat transfer in a channel with a detached rib array have been conducted. Air is the working fluid with the flow rate in term of Reynolds numbers ranging from 8,900 to 35,000. The forms of ribs considered in this study were ribs with rectangular cross section, ribs with groove, broken ribs, and V-shaped ribs. The ribs were deployed transverse or aligned 60?to the main direction of the flow. Local heat transfer coefficients were obtained at various Reynolds numbers within the turbulent flow regime. Area-averaged data were calculated in order to compare the overall performance of the tested ribbed surfaces and to evaluate the degree of heat transfer enhancement induced by the ribs with respect to the smooth channel. The highest heat transfer occurred for the rib with groove was aligned 60?to the main flow direction.