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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical study of a small-scale and low-velocity indoor diffuser coupled with radiant floor cooling
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Experimental and numerical study of a small-scale and low-velocity indoor diffuser coupled with radiant floor cooling

机译：小型低速室内扩散器辐射地板冷却的实验与数值研究

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摘要

We present results of one small scale displacement diffuser coupled with radiant floor cooling. Three control parameters are changed, both numerical and experimentally: flow rate, temperature difference between the undisturbed atmosphere and the supply air, and between the floor and the supply air. Flow visualizations and measurements of the velocity field are carried out using Particle Image Velocimetry for a laminar, axisymmetric, and steady state flow. Numerical simulations show an excellent agreement with experimental data. Special attention is paid to the vicinity of the floor. The main finding in this experimental setup is the appearance of a structure similar to a lee wave, typical in atmospheric flows. This standing wave, named thermal jump in this work, appears while forming a recirculation bubble in a stratified atmosphere with the eruption of the cool air flow that has greater temperature than the ground. To our knowledge, this is the first reported experimental evidence that produces a thermal jump under steady state conditions in air without the breakdown of the plume. Finally, we characterized the heat transfer as function of non-dimensional parameters, showing a parabolic correlation in terms of the radial distance.
机译：我们提出了一种结合辐射地板冷却的小排量扩散器的结果。更改了三个控制参数，包括数值和实验参数：流速，未扰动的大气与送风之间以及地板与送风之间的温度差。使用层流，轴对称和稳态流的粒子图像测速技术进行流场可视化和速度场测量。数值模拟表明与实验数据非常吻合。要特别注意地板附近。在该实验装置中的主要发现是类似于回风的结构的外观，这是典型的大气流动。这种驻波，在这项工作中被称为热跃迁，是在层状大气中形成再循环气泡的同时出现的，其中的冷空气喷出的温度高于地面。据我们所知，这是第一个报道的实验证据，它在稳态条件下在空气中产生热跃变而不会羽状流破裂。最后，我们将传热特性描述为无量纲参数的函数，根据径向距离显示出抛物线相关性。

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  • 作者

    A. Fernandez-Gutierrez; I. Gonzalez-Prieto; L. Parras; J.M. Cejudo-Lopez; C. del Pino;

  • 作者单位

    Universidad of Malaga, Andalucia Tech, Escuela Tecnica Superior de Ingenieria Industrial 29071 Malaga, Spain;

    Universidad of Malaga, Andalucia Tech, Escuela Tecnica Superior de Ingenieria Industrial 29071 Malaga, Spain;

    Universidad of Malaga, Andalucia Tech, Escuela Tecnica Superior de Ingenieria Industrial 29071 Malaga, Spain;

    Universidad of Malaga, Andalucia Tech, Escuela Tecnica Superior de Ingenieria Industrial 29071 Malaga, Spain;

    Universidad of Malaga, Andalucia Tech, Escuela Tecnica Superior de Ingenieria Industrial 29071 Malaga, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Displacement ventilation; CFD; Thermal modeling; Radiant floor;

    机译：置换通风;差价合约热建模辐射地板;

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