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A study on the pressure loss coefficient of non-Newtonian fluids in the stenotic tubes
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 Title & Authors
A study on the pressure loss coefficient of non-Newtonian fluids in the stenotic tubes
Seo, Sang-Ho; Yu, Sang-Sin; Jang, Nam-Il;
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 Abstract
The pressure loss coefficient of Newtonian and non-Newtonian fluids such as water, aqueous solutions of Carbopol-934 and Separan AP-273 and blood in the stenotic tubes are determined experimentally and numerically. The numerical analyses for flows of non-Newtonian fluids in the stenotic tubes are conducted by the finite element method. The effect of the contraction ratio and the ratio of length to diameter on the pressure drop are investigated by the experiments and numerical analysis. The pressure loss coefficients are significantly dependent upon the Reynolds number in the laminar flow regime. As Reynolds number increases, the pressure loss coefficients of both Newtonian and non-Newtonian fluids decrease in the laminar flow regime. As the ratio of length to diameter increases the maximum pressure loss coefficient increases in the laminar flow regime for both Newtonian and non-Newtonian fluids. Newtonian fuid shows the highest values of pressure loss coefficient and blood the next, followed by Carbopol solution and Separan solution in order. Experimental results are used to verify the numerical analyses for flows of Newtonian and non-Newtonian fluids. Numerical results for the maximum pressure loss coefficient in the stenotic tubes are in fairly good agreement with the experimental results. The relative differences between the numerical and experimental results of the pressure loss coefficients in the laminar flow regime range from 0.5% to 14.8%.
 Keywords
Stenotic Tube;Non-Newtonian Fluid;Modified Power-Law Model;Carreau Model;Finite Element Method;Pressure Loss Coefficient;
 Language
Korean
 Cited by
1.
LDV에 의한 곡관덕트에서 난류맥동유동의 유동특성에 관한 실험적 연구,이홍구;손현철;이행남;박길문;

대한기계학회논문집B, 2001. vol.25. 11, pp.1561-1568 crossref(new window)
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