The flow and heat transfer characteristics of a closed-loop cooling system with a mini-channel heat sink for thermal management of electronics is studied experimentally. The heat sink is designed with corrugated fins to improve its heat dissipation capability. The experiments are performed using variable coolant volumetric flow rates and input heating powers. The experimental results show a high and reliable thermal performance using the heat sink with corrugated fins. The heat transfer capability is improved up to 30 W/cm² when the base temperature is kept at a stable and acceptable level. Besides the heat transfer capability enhancement, the capability of the system to transfer heat for a long distance is also studied and a fast thermal response time to reach steady state is observed once the input heating power or the volume flow rate are varied. Under different input heat source powers and volumetric flow rates, our results suggest potential applications of the designed mini-channel heat sink in cooling microelectronics.

Advanced Sludge dewatering system is investigated by the approaches of physical and chemical pretreatment process to improve sludge dewatering performance, based on the degree of difficulty or ease together with the relationship analysis of the existing form of the sludge water. Systems of sludge pre-treatment, sludge filter press and auto-control are elucidated significantly, with the aim that accomplishing the sludge deep dewatering, and making the moisture content of sludge below 55%. This approach can suit to the manipulating locally of the sludge in the sewage treatment plant and save the investment of sludge storage storehouse as well as the cost of transportation.