Large eddy simulation of the turbulence heat and mass transfer of pulsating flow in a V-sharp corrugated channel

•Influence of pulsating condition within V-sharp corrugated channel never studied.•Pulsating conditions contributes to enhance the thermal efficiency factor.•thermal performance factor reaches significant values (from 1.4 to 1.5).•Both A amplitude and fp pulsating frequency play a favorable role in the heat transfer. The convective heat transfer and pressure loss characteristics of flow in a V-sharp Corrugated channel were studied using the LES numerical approach under pulsating inlet conditions. The A amplitude of the imposed pulsation did not exceed 100% of the mean velocity in order to avoid flow reversal (A≤1.0) while St dimensionless frequency was ranged from 0.0 to 0.79. The influence of the pulsating parameters (St, A) as well as Re are studied. Under pulsating condition, flow structures are favored and due to the imposed unsteadiness, heat transfer is enhanced. The 3D flow patterns also underline the driving of coherent structures within a pulsating period; everything occurs as if inlet pulsating conditions favored continuous oscillation between laminar and turbulent behavior. The results revealed that the overall thermal performance of pulsating flow has improved significantly compared with constant flow condition. As a result, pulsating conditions are more efficient in terms of thermal performance factor with values reaching 1.3 to 1.4 for pulsating corrugated channel while values ranging from only 0.9 to 1.17 are reached under constant flow condition.