• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Transient free convection within air-filled hemispherical enclosures. Nu-Ra-Fo relationships for isothermal and inclined disk with dome oriented upwards
【24h】

Transient free convection within air-filled hemispherical enclosures. Nu-Ra-Fo relationships for isothermal and inclined disk with dome oriented upwards

机译：充气半球形外壳内的瞬态自由对流。圆顶朝上的等温斜盘的Nu-Ra-Fo关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Purpose- Nusselt-Rayleigh-Fourier type correlations are proposed to quantify the temporal evolution of convective heat transfer occurring within air-filled hemispherical enclosures whose disk, initially at ambient temperature, is suddenly maintained at a higher temperature. The temperature difference imposed between this hot wall and the isothermal cold dome involves Rayleigh number varying between 10~4 and 2.55 × 10~(12). Depending on the application, the disk can be inclined with respect to the horizontal plane by an angle varying between 0° (horizontal disk) and 90° (vertical disk) in steps of 15°. The paper aims to discuss these issues. Design/methodology/approach- The results are obtained by means of a numerical approach based on the finite volume method. The proposed correlations linked to the steady state Nusselt-Rayleigh internships recently published, concerning the same inclination angle and Rayleigh ranges. Findings- The statistical analysis of a large number of calculations leads to reliable results covering laminar, transitional and turbulent natural convection heat transfer zones. Practical implications- The proposed relationships can be applied in several engineering fields such as nuclear technology, solar energy, security and safety electronics, building, domotics or aeronautics. Originality/value- The new relationships proposed in this paper provide important information on the evolution of convective heat transfer during the transient regime.
机译：提出了目的Nusselt-Rayleigh-Fourier类型相关性，以量化在空气填充的半球形外壳中发生的对流传热的时间演变，该外壳最初在环境温度下会突然保持在较高的温度下。该热壁与等温冷圆顶之间施加的温度差涉及瑞利数，介于10〜4和2.55×10〜（12）之间。根据不同的应用，圆盘可以相对于水平面倾斜一个角度，范围为0°（水平盘）和90°（垂直盘），间隔为15°。本文旨在讨论这些问题。设计/方法/方法-通过基于有限体积法的数值方法获得结果。建议的相关性与最近发表的稳态Nusselt-Rayleigh实习相关，涉及相同的倾角和Rayleigh范围。研究结果-对大量计算的统计分析得出可靠的结果，包括层流，过渡和湍流自然对流换热区。实际意义-提议的关系可以应用于多个工程领域，例如核技术，太阳能，安全和安全电子，建筑，航空航天或航空航天。原创性/价值-本文提出的新关系为瞬态过程中对流换热的演变提供了重要信息。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号