An impact of thermal boundary conditions on characteristics of a non-Newtonian fluid flowing through a sudden pipe contraction

被引：0
作者：
K. E. Ryltseva
G. R. Shrager
机构：
[1] National Research Tomsk State University,
来源：
Thermophysics and Aeromechanics | 2022年 / 29卷
关键词：
numerical modeling; sudden pipe contraction; power-law fluid; flow; viscous dissipation; boundary conditions; local pressure losses;
D O I：
暂无
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学科分类号：
摘要：
A physical-mathematical model of a laminar axisymmetric flow of a power-law fluid through a sudden pipe contraction under non-isothermal conditions is presented with allowance for dissipative effects. The rheology of the liquid medium is determined by the Ostwald — de Waele law. The apparent viscosity is specified as a temperature-dependent function. Two options for setting the temperature boundary conditions on a solid wall are considered: the first implies invariable temperature along the pipe wall; and the second assumes a constant temperature value on the wall except for the area in the contraction plane vicinity, where the boundary is exposed to a zero-heat flux. The process is studied numerically using the finite-difference method. The main characteristics of the flow are calculated and visualized. The effect of thermal boundary conditions on the fluid flow structure and local pressure losses is analyzed.
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页码：217 / 227
页数：10
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