英语翻译This paper presents results from numerical simulations conducted to estimate the inertial range (stopping distance) of large aerosol particles ejected away from local exhaust hoods.Potential flow theory is used to specify the air velocity

英语翻译This paper presents results from numerical simulations conducted to estimate the inertial range (stopping distance) of large aerosol particles ejected away from local exhaust hoods.Potential flow theory is used to specify the air velocity
英语翻译
This paper presents results from numerical simulations conducted to estimate the inertial range (stopping distance) of large aerosol particles ejected away from local exhaust hoods.Potential flow theory is used to specify the air velocity along the centerline of a flanged circular hood.A high-order Gear method is used to integrate the particle equations of motion with drag coefficients in the transitional range.The results allow for a relative comparison of hood performance based on the energy cost needed to stop the particle within a specified distance.Hood size is shown to be a critical factor,while the capture velocity generated by the hood at the point of particle ejection is of secondary importance.
Local exhaust hoods are a primary engineering control for protecting workers from excessive exposure to toxic airborne contaminants.The current design procedure for these hoods relies on the concept of capture velocity outlined in several texts (Burgess et al.,1989; ACGIH,2001).Table 3-1 in the Industrial Ventilation Manual (ACGIH,2001) specifies a range of capture velocities as a function of initial contaminant momentum,or ‘condition of dispersion’ as it is identified in the table.Guidance as to the applicable portion of the range is provided based on mitigating conditions such as cross drafts,hood size,duration of contaminant generation,and toxicity.The table appears to have originated with the work of Kane (1946) and Brandt (1947).

英语翻译This paper presents results from numerical simulations conducted to estimate the inertial range (stopping distance) of large aerosol particles ejected away from local exhaust hoods.Potential flow theory is used to specify the air velocity
本文介绍的数值模拟结果进行估计惯性范围（距离）的大型气溶胶粒子弹射离当地排气罩.势流理论是用来指定的空气流速沿中线的法兰圆形罩.高阶齿轮的方法是把粒子的运动方程与阻力系数的过渡范围.结果允许相对比较遮光罩性能的基础上的能源成本需要停止粒子在一个特定的距离.胡德尺寸是证明是一个关键的因素,而捕获速度所产生的遮光罩点粒子抛射是次要的.局部排气罩是一个主要工程控制保护工人免受过度暴露于有毒空气污染物.目前的设计程序,这些盖依赖的概念,捕捉速度概述一些文本（伯杰斯等人,1989；暴露现象,2001）.表3 - 1在工业通风手册（AC GIH,2001）指定范围的捕获速度作为一个功能的初步污染物的势头,或色散条件为其表中确定的.指导的适用部分的范围内提供的基础上减轻条件如跨草案,胡德大小,持续时间的污染物的产生,和毒性.表似乎起源的工作与凯恩（1946）和勃兰特（1947）.

介绍了数值模拟的结果进行估计的惯性范围(停车距离)的大型气溶胶粒子喷射离开当地排气罩。势流理论用于指定空气流速沿中心线的法兰循环罩。一个高阶齿轮方法被用来把粒子运动方程和阻力系数过渡范围。结果提供了一个相对比较罩性能基于消耗的能量需要停止粒子在一个指定的距离。遮光罩尺寸显示是一个关键的因素,而捕获速度产生的引擎盖上的粒子喷发是次要的。
当地的排气罩是一个主要工程控制保护工人的过度暴露于有毒...

全部展开

介绍了数值模拟的结果进行估计的惯性范围(停车距离)的大型气溶胶粒子喷射离开当地排气罩。势流理论用于指定空气流速沿中心线的法兰循环罩。一个高阶齿轮方法被用来把粒子运动方程和阻力系数过渡范围。结果提供了一个相对比较罩性能基于消耗的能量需要停止粒子在一个指定的距离。遮光罩尺寸显示是一个关键的因素,而捕获速度产生的引擎盖上的粒子喷发是次要的。
当地的排气罩是一个主要工程控制保护工人的过度暴露于有毒空气污染物。当前设计程序对这些罩依赖的概念,概述了在几个文本捕获速度(伯吉斯等问题,1989分;ACGIH,2001)。表3 - 1在工业通风手册(ACGIH,2001)指定一个范围的捕获速度作为一个函数的初始污染物势头,或“条件的色散的因为它确定了桌子上。指导,适用范围的部分提出了基于减轻条件比如交叉的草案,遮光罩尺寸、病程污染物产生、毒性。桌子上似乎起源于凯恩的工作(1946)和布兰特(1947)。
。。。

收起