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不同地表粗糙度坡面流水力学特性试验研究 被引量:1
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作者 张旖璇 马岚 +4 位作者 薛梦华 孙旭 王福星 李浩玉 宋天翼 《陕西师范大学学报(自然科学版)》 CAS CSCD 北大核心 2023年第6期1-10,共10页
为进一步探明坡面流水力学特性,通过室内定床放水冲刷试验,研究了不同流量和坡度下不同粗糙度(0.2~0.6 mm、0.6~1 mm、1~1.4 mm、1.4~2 mm、2~3 mm粒径和光滑对照组)下垫面的坡面流水力学特性。结果表明:下垫面粗糙度的增加减缓了坡面... 为进一步探明坡面流水力学特性,通过室内定床放水冲刷试验,研究了不同流量和坡度下不同粗糙度(0.2~0.6 mm、0.6~1 mm、1~1.4 mm、1.4~2 mm、2~3 mm粒径和光滑对照组)下垫面的坡面流水力学特性。结果表明:下垫面粗糙度的增加减缓了坡面流流速,增大了水深,且流速和水深均与流量、坡度和粗糙度因子呈良好幂函数关系;雷诺数在对照组达最大值,粗糙度的增加使流型趋于缓流;阻力系数随粗糙度呈正势变化,其与流量、坡度、粗糙度因子的幂函数回归关系较好;计算径流剪应力与实测径流剪应力在对照组下垫面的关系良好,粗糙度增加对实测径流剪应力的增加有一定影响。研究成果对深入认识土壤侵蚀机理和坡面侵蚀防治具有重要意义。 展开更多
关键词 坡面流 粗糙度 水力学参数 径流剪应力
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Blood flow analysis in tapered stenosed arteries with pseudoplastic characteristics 被引量:5
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作者 Noreen Sher Akbar S. Nadeem 《International Journal of Biomathematics》 2014年第6期89-106,共18页
In this paper, the blood flow through a tapered artery with a stenosis by considering axially non-symmetric but radially symmetric mild stenosis on blood flow characteristics is analyzed, assuming the flow is steady a... In this paper, the blood flow through a tapered artery with a stenosis by considering axially non-symmetric but radially symmetric mild stenosis on blood flow characteristics is analyzed, assuming the flow is steady and blood is treated as Williamson fluid. Per- turbation solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different type of tapered arteries (i.e. converging tapering, diverging tapering, non-tapered artery) have been examined for different parameters of interest. 展开更多
关键词 Williamson fluid blood flow tapered artery STENOSIS perturbation solution.
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Mixed convection analysis for blood flow through arteries on Williamson fluid model
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作者 Noreen Sher Akbar DBSg_4H, CEME 《International Journal of Biomathematics》 2015年第4期53-72,共20页
In this paper, the blood flow through a tapered artery with a stenosis by considering axially non-symmetric but radially symmetric mild stenosis on blood flow characteris- tics is analyzed, assuming the flow is steady... In this paper, the blood flow through a tapered artery with a stenosis by considering axially non-symmetric but radially symmetric mild stenosis on blood flow characteris- tics is analyzed, assuming the flow is steady and blood is treated as Williamson fluid. The effects of mixed convection heat and mass transfer are also carried out. Perturbation solutions have been calculated for velocity, temperature, concentration, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different types of tapered arteries (i.e. converging tapering, diverging tapering, non-tapered artery) have been examined for different parameters of interest. Streamlines have been plotted at the end of the paper. 展开更多
关键词 Williamson fluid blood flow tapered artery STENOSIS perturbation solution mixed convection heat and mass transfer.
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Mathematical analysis of Phan-Thien-Tanner fluid model for blood in arteries
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作者 Noreen Sher Akbar S. Nadeem 《International Journal of Biomathematics》 2015年第5期215-230,共16页
In the present paper, we have studied the blood flow through tapered artery with a stenosis. The non-Newtonian nature of blood in small arteries is analyzed mathematically by considering the blood as Phan-Thien-Tanner... In the present paper, we have studied the blood flow through tapered artery with a stenosis. The non-Newtonian nature of blood in small arteries is analyzed mathematically by considering the blood as Phan-Thien-Tanner fluid. The representation for the blood flow is through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is another important feature of our analysis. Exact solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different type of tapered arteries (i.e. converging tapering, diverging tapering, non-tapered artery) have been examined for different narameters of interest. 展开更多
关键词 Phan-Thien-Tanner fluid blood flow tapered artery stenosis exact solu-tions.
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