The direct contact heat exchanger analyzed herein refers to the restricted definition of systems of immiscible liquids, solid particles in fluids, and droplets in gases. An analytic way to evaluate the performance of a direct contact heat exchanger is applied to examine the effects of operational variables upon the length and diameter of the heat exchanger. The heat exchanger becomes shorter as the particle size decreases and the heat capacity ratio, flow rate ratio, and temperature difference increase. The diameter of the column decreases with the particle size, and the density ratio of the contacted media. It increases with the flow rate ratio. All the evaluations made correspond to a laminar bulk flow in the heat exchanger, and to particle Reynolds numbers in the range of 20 to 500.
ASJC Scopus subject areas
- Mechanical Engineering