No abstract

The high‐energy costs in the drying process highlight the employment of vibration which is a promising way to intensify this process. This work presents a three‐dimensional (3‐D) numerical version that exhibits the coupled heat and mass transfer phenomena posed by the external vibrating flow of hot air during the drying process. In order to simulate 3‐D vibrating drying, a 3‐D unstructured control volume finite element method is developed to analyze the heat and mass transfer during unsaturated porous media drying. Numerical simulation results, which depict the effects of the external vibrating flow which forces the drying process to occur more rapidly and intensively than ever before, are presented and analyzed.

This work investigates heat transfer enhancement for a porous ceramic heat exchanger. The effect of flow-induced vibration of exchanging air flow through porous tube banks has been tested. A numerical model able to assess the vibration effect on heat and mass transfer inside a porous ceramic exchanger has been carefully developed. A three-dimensional unstructured control volume finite element method (CVFEM) is developed to simulate the transport phenomena that arise during convective exchange. In this respect, several numerical tests have been conducted. The time evolution of temperature, liquid saturation, and pressure of the porous domain are analyzed and compared for two cases: with and without vibration. It is found that the vibration highly enhances the heat and mass transfer inside the ceramic exchanger. As a result, the gain of exchanging time to reach the thermal equilibrium between the hot air and the porous domain was 75% for the case of air vibration under sawtooth type at a frequency of f v = 5 Hz and V max = 10 m/s compared to nonvibrating exchange.