PURPOSE: To enhance the heat radiating performance without increasing pressure loss of a heat sink by providing many plate-shaped fins at a heat sink or a microheat sink unit and forming a plurality of inlet and outlet portions for a cooling fluid on the top surface of the heat sink.
CONSTITUTION: A plurality of nozzles 3 with a rectangular section are provided on the top surface of a heat sink where many plate-shaped fins 2 are provided on a fin base 1 and are used as a guiding portion for the cooling fluid. At the same time, a plurality of outlet portions 4 of the cooling fluid are formed on the upper surface of the heat sink, a substantial channel length for flowing the cooling fluid is reduced, a discharge of cooling fluid flowing each effective channel is reduced, and a pressure loss due to the flow of the cooling fluid is decreased. Thus, the heat radiating performance can be enhanced without increasing the pressure loss of the heat tank.
OHASHI SHIGEO
HATADA TOSHIO
