通过使用四面体形状的流器在矩形太阳能空气加热器管道中提高热性能
Anoop Kanjirakat1, Anuraag M Kamath2, Sohail A Khan2
1Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
Scientific reports
|November 29, 2025
概括
四面体轮机增强太阳能空气加热器 (SAH) 的传热. 最佳的几何形状,包括负的前沿角和降低的斜率,通过改善混合和减少摩擦,显著提高了热液压性能 (THP).
科学领域:
- 可再生能源工程可再生能源工程
- 热科学 热科学 热科学
- 流体动力学 流体动力学
背景情况:
- 太阳能空气加热器 (SAH) 对可再生能源至关重要,但经常面临热传输限制.
- 提高SAH的传热效率是提高其性能和经济可行性的关键.
研究的目的:
- 调查四面体形状轮机对SAHs热传递的影响.
- 为了评估热液压性能 (THP),考虑热传递增强和摩擦损失.
- 为了优化轮机的几何结构,以获得最大的SAH效率.
主要方法:
- 使用了三维计算流体动力学 (CFD) 分析.
- 进行了参数研究,以评估几何参数 (如斜率,高度和前沿角) 的影响.
- 用热液压性能 (THP) 参数来量化整体效率.
主要成果:
- 四面体轮机显著提高了SAHs中的传热效率.
- 较低的相对纵向距离 (P/D) 和增加的轮机高度提高了努塞尔特数和混合.
- 一个负的前沿角 ([公式:见文本]) 与一个中性角 ([公式:见文本]) 相比,产生了优越的THP.
结论:
- 四面体轮机在增强SAH中的热传递方面是有效的.
- 最佳的几何配置,包括特定的斜率,高度和负前沿角,最大限度地提高THP.
- 在Reynolds数为9000的特定几何参数下,获得了1.78的最佳THP.
更多相关视频
10:03Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
Published on: October 5, 2018
8.6K
13:27Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
Published on: June 8, 2015
9.1K
相关概念视频
01:22Thermal Insulation in Masonry Walls
458
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
458
01:20Mechanisms of Heat Transfer II
4.1K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.1K
01:14Mechanisms of Heat Transfer I
5.9K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
5.9K
01:19Mechanism of heat transfer
1.8K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.8K
01:14Mechanisms of Heat Transfer
1.6K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
1.6K
01:27Thermal expansion and Thermal stress: Problem Solving
2.1K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
2.1K