波纹管热负荷及其对流体摩擦系数的影响

P. Nyarko
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引用次数: 4

摘要

本文研究了热负荷对二维轴对称直波纹管层流流体摩擦系数的影响。在NavierStokes方程的基础上,提出了一些巧妙的假设,推导出计算流动摩擦系数的解析表达式,包括平均速度、流体密度、压降和雷诺数。对动量和能量耦合方程进行了数值求解,并分析了热负荷对波纹管摩擦系数的影响,从而计算了波纹管的水头损失。引入了一种新的计算波纹周期性定位管道准周期性的几何方法。这对减少溶液中的不稳定性具有积极作用,并显示出周期性压力分布的有趣特征。计算时间和CPU内存大大减少,因为只模拟一个周期,作为一个无限长管道的真实表示,其中的流动充分发展。我们表明,热负荷降低了波纹管的摩擦系数,这预先假设了热带地区的泵要求与温带地区的泵要求不同。穆迪图显示了在不受热负荷影响的情况下,不同波纹高度下的摩擦系数和雷诺数。在本文中,我们展示了在恒定波纹高度下不同入口和壁面温度下的摩擦因数和雷诺数的示意图。此外,我们还表明,当流动充分发展时,边界温度的周期化不会影响流动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Heat Load and its Effects on Fluid Friction Factor in Corrugated Pipes
In this paper, we investigate the effect of heat load on the fluid friction factor for laminar flow of a 2D axisymmetric straight corrugated pipe. Some clever assumptions are made on the NavierStokes equations to derive analytic expressions for computing the friction factor for the flow in terms of average velocity, density of the fluid, pressure drop and Reynolds number. The coupled momentum and energy equations are solved numerically and the effect of the heat load on the friction factor and hence the computed head loss in corrugated pipes/hoses analyzed. A new geometry is introduced for computing quasi-periodicity in pipes whose corrugations are periodically positioned. This has a positive effect of reducing instabilities in the solution and shows interesting features of the periodic pressure profile. Computational time and CPU memory have been drastically reduced as a result of simulating only one period as a true representation of an infinitely long pipe in which the flow is fully developed. We show that the heat load reduces the friction factor in corrugated pipes, this presupposes that pump requirements in the tropics are different from temperate regions for the same work done. The Moody Diagram shows a plot of the friction factor and Reynolds number at different corrugation heights without the effect of varying heat load. In this paper we show a diagram of the friction factor and Reynolds numbers at varying inlet and wall temperatures at a constant corrugation height. Furthermore we show that when flow is fully developed, periodizing the temperature on the boundary does not affect the flow.
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