退伍军人康复部门规划的特点:国际经验分析

Oleksandr Yu. Spivak, Nataliia Rezydent, Dmytro M. Rezydent, Nazariy O. Tkach
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摘要

研究了带有横向圆形翅片的单管在强制对流过程中的传热问题。考虑到沿板高度的温度分布,提出了一个数学模型,用于确定通过带圆肋的圆柱表面传热时从液体流向气体流的比热流量。研究揭示了圆形翅片的几何尺寸对通过圆柱形外翅片表面的传热和比热流量的影响。根据在 MathCAD 环境中模拟传热过程的结果显示,当翅片高度增加时,总传热热流量会增加,但空气侧的传热系数会降低,在这种情况下,翅片直径为 31...32 毫米时比热流量最小。通过翅片表面的最大比热流量出现在翅片厚度 δ = 2 毫米时,而翅片厚度的减小会导致传热表面质量的减小和翅片效率系数的降低。影响圆形横向管翅片效率的一个重要因素是翅片之间的间距。增加管道上翅片的间距会导致翅片侧面的传热系数增大,比热流量减小。每增加 0.005...0.02 米的间距,翅片管表面的热交换强度和通过管道的比热流量就会增加 1.5...2 倍。已确定最小的翅片步长是热交换器的最佳步长,但值得考虑的是,铝翅片管道的现代工业技术在技术上和经济上的便利性,以及在管道上翅片间距减小的情况下水力阻力的显著增加,这导致需要使用更突出和功率更大的注塑机。所得结果可用于优化带有横向圆形翅片的管式气水热交换器的几何尺寸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
FEATURES OF PLANNING REHABILITATION DEPARTMENTS FOR VETERANS: AN ANALYSIS OF INTERNATIONAL EXPERIENCE
The heat transfer of a single pipe with transverse round fins during forced convection is considered. A mathematical model is proposed for determining the specific heat flow from a liquid to a gas flow during heat transfer through a cylindrical surface ribbed with round ribs, taking into account the temperature distribution along the height of the plate. The influence of the geometric dimensions of circular fins on heat transfer and specific heat flow through a cylindrical externally finned surface was revealed. According to the results of the simulation of the heat transfer process in the MathCAD environment, it is shown that in case of an increase in the height of the fin, the total heat transfer heat flow increases, but the heat transfer coefficient from the air side decreases in this case, the minimum specific heat flow is observed at a fin diameter of 31...32 mm. The maximum specific heat flow through the finned surface occurs for the fin thickness δ = 2 mm, while the decrease in fin thickness leads to a decrease in the mass of the heat transfer surface and a decrease in the efficiency coefficient of the fin. A significant factor that affects the efficiency of circular transverse pipe fins is the pitch between the fins. An increase in the pitch of the fins on the pipe leads to an increase in the heat transfer coefficient from the side of the fins and a decrease in the specific heat flow. The value of the intensity of heat exchange from the surface of the finned pipe and the specific heat flow through the pipe changes by 1.5...2 times per step between the ribs of 0.005...0.02 m. It was established that the smallest step of finning would be optimal for the heat exchanger, but it is worth considering the technical the economic expediency of modern industrial technologies of finning pipes with aluminum and a significant increase in hydraulic resistance in the event of a decrease in the pitch of the fins on the pipe, which leads to the need to use injection machines of greater prominence and power. The obtained results can be used to optimize the geometric dimensions of tubular gas-water heat exchangers with transverse round fins.
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