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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer in evaporating black liquor falling film
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Heat transfer in evaporating black liquor falling film

机译：蒸发黑液降膜中的传热

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摘要

Black liquor is a fluid with high viscosity, implying high Pr numbers. Most of the previously developed correlations for falling film evaporation heat transfer were developed for fluids with relatively low Pr numbers, and therefore are not valid for most black liquor evaporation conditions. Experimental heat transfer data from black liquor evaporation are presented here. They show that the Nu number, as expected, increases in the turbulent region. However, at a specific Re number for each Pr number level, the Nu number ceases to increase with increasing Re number. A new correlation, taking this observation into account, has been developed on the basis of experimental data in the region of 4.7 < Pr < 170 and 47 < Re < 6740, and is presented in this paper. A dry solid content dependence is included in the new correlation and improves its predictions for black liquor.
机译：黑液是具有高粘度的流体，意味着高Pr值。对于降膜蒸发传热，以前开发的大多数关联都是针对Pr值相对较低的流体开发的，因此不适用于大多数黑液蒸发条件。这里介绍了黑液蒸发的实验传热数据。他们表明，如预期的那样，Nu数在湍流区域增加。但是，对于每个Pr编号级别，在特定的Re编号下，Nu编号不会随着Re编号的增加而增加。在4.7

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