NUMERICAL INVESTIGATION ON SIMULTANEOUS EFFECTS OF SURFACE ROUGHNESS AND VARIABLE PROPERTIES ON LAMINAR FLOW IN ANNULAR TUBES

机译：圆管表面粗糙度和变量特性对层流同时影响的数值研究

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A comprehensive study is conducted to evaluate the heat transfer characteristics of laminar nanofluid flow in an annular tube. Thermo-physical properties of the nanofluid is considered to be variable and for the inner and outer walls, there exists serrated surface roughness. The study focuses on the velocity distribution, friction factor and Nusselt number. All results are compared with those for the smooth channel and constant property nanofluid as well. The results show that the tube with serrated wall experiences greater maximum velocity. Moreover, decrease in velocity gradient and some other thermal characteristics result in decrease in average Poiseuille and Nusselt numbers for the rough tube with variable-property fluid.

机译：进行综合研究以评价环管中层状纳米流体流动的传热特性。纳米流体的热物理性质被认为是可变的，并且对于内壁和外壁，存在锯齿状表面粗糙度。该研究侧重于速度分布，摩擦因子和营养数。将所有结果与光滑通道和恒定性纳米流体的结果进行比较。结果表明，带有锯齿状壁的管经历了更大的最大速度。此外，速度梯度和一些其他热特性的减小导致平均粗管的平均水管和具有可变性质流体的果实数量的降低。

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《ASME international mechanical engineering congress and exposition》|2018年|V08BT10A015.1-V08BT10A015.7|共7页
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Morteza Heydari; AmirHossein Bagheri; Hamid Sadat; Huseyin Bostanci; Seifollah Nasrazadani;
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NUMERICAL INVESTIGATION ON SIMULTANEOUS EFFECTS OF SURFACE ROUGHNESS AND VARIABLE PROPERTIES ON LAMINAR FLOW IN ANNULAR TUBES

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