散射消光系数对干燥速率的影响

M. Akintunde
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引用次数: 0

摘要

干燥是为了以尽可能低的成本保存。干燥的方法可分为两大类——自然的和人工的。在自然干燥法中,太阳辐射是需要的主要因素。据观察,只有不到30%的太阳辐射真正到达地球表面,其余的辐射被其所经过的介质的粒子反射或散射。随着人类在地球表面活动的增加,更多的粒子被释放到大气中,因此太阳辐射散射(或消失)的速度在增加。到达地球表面的太阳辐射被散射的速率是假设地通过在半封闭的太阳能干燥器中干燥潮湿的农产品来测量的。从农产品中蒸发的水分(形成烟雾)被用作假设的大气颗粒。观察了这种辐射散射(散射消光系数,或kvalue)对干燥速率的影响。注意到k值随着颗粒量的增加而增加,这导致干燥速率降低。据判断,释放到大气中的颗粒越多,辐射就会分散得越多,农产品的干燥速度也会减慢。由于臭氧消耗导致全球普遍变暖,这种影响目前尚不为人所知。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of scattering extinction coefficient on drying rate
Drying is purposely meant for preservation at lowest possible cost. The methods of drying can be categorized into two broad headings - Natural and Artificial. In the natural drying method, solar radiation is the major factor required. It has been observed that less than 30% of the radiation from the sun actually reaches the earth surface, the rest are reflected or scattered by the particles of the media through which it passes. As human activities on the earth surface increase, more panicles are released into the atmosphere and hence the rate at which the solar radiation is scattered (or extinct) is at increase. The rate at which the solar radiation reaching the earth surface is scattered was hypothetically measured by drying moist produce in a semi-closed solar drier. The evaporated moisture (forming smog) from the produce was used as the hypothetical atmospheric particles. The effect of this radiation scattering (scattering extinction coefficient, or kvalue) on the drying rate was observed. It was noted that the k-value increases as the amount of particles are increased, and this led to a decrease in drying rate. It was adjudged that, has more particles are released into the atmosphere more radiation will be scattered and drying rate of produce will be reduced. This effect is not known at present due to the general global warming resulting from ozone depletion.
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