Search Results for Yamam Taqi Abed

Abstract

An experiment was conducted on two types of microchannels (zigzag and symmetrical circular) using water as the working fluid under normal boiling conditions. Heat fluxes ranging from 180 to 780 kW/m² were used, the Reynolds number varied from 58 to 107, and the water flow was streamlined. Temperatures were measured at ten ports (inlet, outlet, and walls). The results showed that for the zigzag channel at a heat flux of 580 kW/m², the average wall temperature decreased from 112°C to 87°C as the Reynolds number increased to 107. Both the Nusselt number (from 42 to 86) and the Reynolds number (from 58 to 107) also increased. The zigzag channel exhibited an improvement in heat transfer coefficient with a 30% decrease in the average temperature. The temperature of the circular cavity channel decreased from 126°C to 96°C, while the flow remained constant. Flow patterns were captured using a high-resolution camera for study during boiling.