Shigeru Kadota

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 refrigerant flow control

In a compact closed two-phase thermosyphon which consists of a multitube radiator and a refrigerant bath, it is observed that the heat radiation performance drops as the refrigerant bath becomes thin. We have found that this is due to vapor–liquid interaction and dryness in the upper side of the boiling area. We have also improved that heat radiation performance with a new refrigerant flow controller. ©1999 Scripta Technica, Heat Trans Asian Res, 28(8): 627–639, 1999

Compact Thermosyphon with Refrigerant Flow Control. Improvement of Heat Transfer Characteristics in the Cooling Unit with Multiple Power Modules Mounted Vertically.

In a compact closed two-phase loop thermosyphon which consists of a multi-radiator and a refrigerant bath with multiple power modules mounted vertically the heat radiation performance deteriorates as the refrigerant bath becomes thinner. We have found that this is because the return condensate is blocked by the backflow of the bubble in the return path when the heat load decreases and increases sharply. We have also improved the heat radiation performance by providing an adiabatic path between the boiling area and the return path.