A practical model for investigating heat and mass transfer in a direct contact heat exchanger.

摘要

A simple numerical model is developed to serve as a design tool by providing a fundamental understanding of the direct contact heat and mass transfer process between moist air and a single charged drop under the influence of gravity and an electric field. The model output is the time history of a droplet's temperature, size, and trajectory. The model is used in conjunction with a factorial analysis to determine the dominant variables in the heat and mass transfer process. The findings show that the air's humidity level has the largest effect on system response, followed by the drop size. A discussion of the models range of validity and variance due to temperature dependant properties is included as well as an example of how the model can be used for preliminary heat exchanger design.