Mass Transfer Rates

It has been shown that stage efficiency prediction and scale-up are difficult and unreliable. For highly nonideal, polar and reactive systems, a transport phenomena approach for predicting mass transfer rates is preferred. Such mass transfer rates are calculated continuously along the column similarly to the HETP calculation for packed columns.

Nonequilibrium models for the calculation of mass transfer rates assume that, while the bulk vapour and liquid phase are not in equilibrium with each other, there is an equilibrium at the interface. Hence, the net loss or gain for a component at the interface is expressed in a rate form. For instance, the net gain by the vapour because of the transfer at the interface is:

There exist various correlations for predicting the value of the HETP. One of most commonly used is the Sherwood correlation. It can be expected that HETP will change with respect to the operating conditions, physical properties of the liquid, etc., so, it is calculated in terms of correlations containing many factors.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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