Nissan Motor Company Limited

Yousuke Koizuka

Tatsuomi Nakayama

Yoshiteru Yasuda

Toshikazu Nanbu

Kazuhiko Takashima

Yoshitaka Uehara

Minoru Ota

Tokio Sakane

Ichiro Ishikawa

The heat-radiating system which radiates heat by heat exchange between a substrateand cooling fluid. The heat-radiating system has a cooling structure that includes a vortex flow generating portion Con the surface of the substratein contact with the cooling fluid. The vortex flow generating portion Cis composed of a plurality of recessesthat extend in the direction &#x3b2; intersecting the flow direction of the cooling fluid and causes a vortex flow depending on the flow condition of the cooling fluid. The recess depth H of the vortex flow generating portion and the laminar sub-layer thickness &#x3b4;near the wall surface satisfy the relation of H&#x3e;&#x3b4;=63.5/(Re)&#xd7;d (where Re is the Reynolds number, d is the characteristic length, and the Reynolds number is Re=ud/v where v is the kinematic viscosity of the cooling fluid, u is the flow velocity of the cooling fluid and d is the characteristic length), and operation of the heat radiating system is controlled such that the flow conditions of the cooling fluid fall within the range in which the relation of u/v&#x2264;206&#xd7;d(where u, v and d are as defined above) satisfied.

Heat-radiating system

A cooling structure for cooling a heat generating element allows cooling fluid to circulate around the heat generating element or a base material with the heat generating element disposed thereon. The cooling structure is provided with a vortex-flow generating portion which extends in a direction intersecting a circulation direction of the cooling fluid, and which generates a vortex flow depending on the flow rate of cooling fluid.

Cooling structure, vortex-flow forming plate molding apparatus, and method for molding vortex-flow generating portion

There is provided a low-friction sliding member having a sliding surface slidable relative to an opposing member via an oil, wherein the sliding surface has a plurality of texture groups, each of the texture groups consists of at least two adjacent fine recesses having portions aligned to each other in either a sliding direction or oil flow direction; a distance between the texture groups is larger than a distance between the adjacent recesses; and the texture groups is distributed uniformly over the sliding surface.

Low-friction slide member, production apparatus therefor and process for producing the same

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Kanagawa, Japan

Yousuke Koizuka