Hiroyuki Osakabe

Thermosyphon by refrigerant self-excited oscillation

In a compact closed two-phase thermosyphon, the boiling area is adjacent to the condensation area, and the condensation area is provided with innerfins different from conventional thermosyphons. We clarified that the combination of condensation and self-excited oscillation convection resulted in a good heat release. To intensify this self-excited oscillation, we made the innerfin unsymmetrical, and consequently an improvement was realized.

Flow‐controlled thermosyphon using multi‐stacked radiator cores

We have been developing a more compact cooling unit compared with the conventional, cooling aluminum fin and the heat pipe-type cooling unit. The aim of this paper is to examine the cooling performance of the cooling unit using multi-stacked radiator cores and a new flow controller. We propose a new simple structure for the refrigerant circulation flow using multi-stacked radiator cores with holes at both ends. Further we clarified that the cooling performance is greatly improved by the new refrigerant flow controller if the cooling unit is inclined.

Compact thermosyphon using multistacked radiator cores for automobiles: Refrigerant circulation and cooling performance

A new closed two-phase loop thermosyphon with multi-stacked radiator cores and a new flow controller forming a refrigerant circulation have been developed. When the temperature of the partition wall which separates the liquid return passage from boiling the region of the refrigerant tank becomes extremely high, the refrigerant circulation is inhibited. The inhibition factor of the refrigerant circulation was clarified.

Compact boiling refrigerant-type cooling unit using multi-stacked radiator cores for automobiles

We have developed a new closed two-phase loop thermosyphon with multi-stacked radiator cores and a new flow controller which forms refrigerant circulation. The features are: (1) more compact and lighter weight than heat pipe cooling units, (2) cooling performance can be easily adjusted by the number of radiator cores according to heat dissipation quantity.