Inner Radius Of Tube Research Articles

Modelling and simulation of three-roll bending process of bimetal Circular Billet

Bending process is an important metal forming technique which is used on industrial scale. An asymmetric three-roll bending is sub-type bending process and has a simple configuration. The present study has focused on the investigation of the bonded bimetal billet. The two material consist of copper alloy rod inside an aluminium alloy (AA 6061-T6) tube with one common dimension between the rod and the tube which is the radius of rod and the inner radius of tube. The effect of varying the radius has considered on this study. The results shown that the increasing of copper alloy radius increased the reaction load and the mass of the bimetal billet with exponential increment.

Numerical study for MHD peristaltic flow of Williamson nanofluid in an endoscope with partial slip and wall properties

The purpose of present analysis is to explore the peristaltic flow of Williamson nanofluid in an endoscope. Inner tube is rigid while the outer is subject to sinusoidal peristaltic wave. The outer tube satisfied partial slip condition while inner tube has no slip condition. Complaint wall properties are considered. Such preferences are practical in blood capillaries where inner radius of tube is very small. Long wave length and small Reynolds number are taken into account. Numerical study is performed for the outcoming problem. Impact of physical quantities are discussed through graphs for velocity, temperature and concentration respectively. The attributes of this study are presented in last section and a good agreement is found with existing literature. It is concluded that slip causes decrease in velocity and temperature. Whereas temperature and concentration give opposite response wih rise in thermophoresis and Brownian diffusion.

An analysis of oxygen absorption in a tubular membrane oxygenator

AbstractAn analysis of oxygen absorption by blood flowing through a small oxygen‐permeable fiber in steady state laminar flow is presented. The rigidity and geometry of the fibers eliminate unpredictable shunting and distention, permitting a more detailed analysis of blood‐membrane factors than has previously been undertaken. The mathematical analysis treats the blood as a homogeneous, non‐Newtonian fluid with a reversible nonlinear oxygen sink (erythrocytes). The differential equations are solved numerically and the results of the parametric analysis are presented. The parameters that have a major influence on residence time necessary to obtain a specified oxygen content are the Grashof number, the concentration of hemoglobin in the blood, and wall Nusselt number, γ: γ = DLαL/DMαM In [1 + tm/R] where D = diffusion coefficient, α = Bunsen solubility coefficient, subscript L = liquid in tube, subscript M = tube material, R = inner radius of tube, tm = tube wall thickness.Comparison of the experimental results to the model indicate that mixing due to the heterogeneous nature of blood is minimal and that the major limitation in oxygen absorption is the blood film. Means of reducing this resistance are discussed.

463. 磁場を横切る水銀の管内流の熱伝達

This paper deals with channel flow and heat transfer experiments undertaken toexamine the influence of a transverse magnetic field on the heat transfer of an electrically conducting fluid. Measurements were made of the velocity distribution, friction factor, critical Reynolds number for transition from laminar flow, and heat transfer coefficient on liquid mercury flowing through several tubes 1m long under the effect of uniform transverse magnetic field. The experimental results were correlated with the Reynolds number(<2×105) and the Hartmann number(<55referred to inner radius of tube).The magnetic field reduces the heat transfer coefficient in the region between the Péclet number=2×10102 and 4×103. The Hartmann number as well as the Péclet number affects the Nusselt number which drops as much as 40% in the most prominent case when the Hartmann number=55.