Experimental Investigation on Convective Heat Transfer Enhancement by Ehd

Transient exergetic efficiency and moisture loss analysis of forced convection drying with and without electrohydrodynamic enhancement

“…A total of three different wire-electrode configurations were used for EHD drying as studied by Hamdi et al [31] (i.e. two wireelectrodes arranged parallel to each other and aligned parallel to airflow, one wire-electrode aligned parallel to airflow, and one wire-electrode aligned perpendicular to airflow).…”

“…Goodenough et al [30] commented, in a study on the efficiency of corona wind on paper towels and biscuits, that "the arrangements of the electrodes is crucial for effective operation." A recent study by Hamdi et al [31], which was similar in principle to Lai [29], investigated the direct heat transfer enhancement associated with EHD flow due to varying wire-electrode arrangements. In that particular study, a horizontal airflow channel was used to study three different wire-electrode arrangements (i.e.…”

“…More specifically, when comparing all three wire-electrode configurations for an applied voltage of 16 kV, one wire-electrode arranged parallel to airflow resulted in the greatest increase in heat transfer. Hamdi et al [31] therefore demonstrated a direct increase in convective heat transfer due to EHD flow when compared to pure force convection, although no direct measure of drying rate or efficiency was measured for any specific food product.…”

“…The purpose of this study was to use the wire-electrode configurations determined by Hamdi et al [31] to compare the drying performance of EHD drying compared to FC drying. Drying performance was quantified in terms of drying rate and transient and overall exergetic efficiency by means of a proposed model [39].…”

“…Results were compared to FC drying to determine which primary airflow velocities would result in the same drying rate as EHD drying. In addition, results were also used to determine if the wireelectrode configuration (determined by Hamdi et al [31]) that resulted in the greatest heat transfer enchancement also correlated to the greatest moisture loss.…”