Yin Jixiang,Li Guojun,Feng Zhenping
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China£©
Abstract:Investigations on the three-dimensional steady laminar flow and heat transfer characteristics were conducted for the multiª²channel with the sine-wave crossed corrugated primary surface£® The effects of corrugation angle(¦È),the ratio of the wave length P to height H(P£¯H),and Reynolds numbers(Re) on the flow and heat transfer performance were studied using numerical simulation£® The results obtained show that the flow and heat transfer performance changes significantly in the entry region and this change disappears basically after the fourth cell number along the main flow direction£® Under the condition of the same hydraulic diameter£¬ Nusselt number (Nu) and friction factor(f) increase with increasing ¦È£® In addition£¬Nu and f increase with P/H when P£¯H is between 1.5 and 3.1£¬ and decrease with the increase of P/Hª« when it is between 3.1 and 4.0 with the excess of Re over 900£®The maximum of the wall surface local Nu is located near the main flow trailing position and at the entrances of the neighborhood outflows;the minimum of local Nu is obtained at these points where the top plate touches the bottom one£®
Keywords£ºcrossedª²corrugated primary surface;heat transfer augmentation;laminar flow; multiª²channel model