Boil Cooling Method, Boil Cooling Apparatus, Flow Channel Structure and Applied Product Thereof

A cooling method by microbubble emission boiling, comprising using a surface of an object to be cooled or a surface of a heat-transfer member coming into close contact with the surface of the object to be cooled as a surface to be cooled, causing a subcooled cooling liquid to flow through a tubular flow channel provided on the surface to be cooled, growing bubbles generated by boiling of the cooling liquid on the surface to be cooled, which is heated, and condensing and collapsing a coalesced bubble formed in a contacted state so as to cover the surface to be cooled by the cooling liquid to make heat flux heat removal at a temperature higher than a temperature, at which a critical heat flux is obtained, wherein as the tubular flow channel, a flow channel structure that the surface to be cooled forms a part of and the same plane as an inner wall of the flow channel, and which has a group of fine-diameter rigid needles fixed to the inner wall of the tubular flow channel and protruded toward the surface to be cooled within the flow channel or on the surface to be cooled is used, and the condensation and collapse are conducted in a state that at least part of the group of rigid needles are entered into the coalesced bubble, thereby reducing a pressure generated upon the collapse of the coalesced bubble.

A cooling apparatus by microbubble emission boiling, which is a boil cooling apparatus used in a cooling method by microbubble emission boiling, comprising using a surface of an object to be cooled or a surface of a heat-transfer member coming into close contact with the surface of the object to be cooled as a surface to be cooled, causing a subcooled cooling liquid to flow through a tubular flow channel provided on the surface to be cooled, growing bubbles generated by boiling of the cooling liquid on the surface to be cooled, which is heated, and condensing and collapsing a coalesced bubble formed in a contacted state so as to cover the surface to be cooled by the cooling liquid to make heat flux heat removal at a temperature higher than a temperature, at which a critical heat flux is obtained, wherein a flow channel structure that the surface to be cooled forms a part of and the same plane as an inner wall of the flow channel, and which has a group of fine-diameter rigid needles fixed to the inner wall of the tubular flow channel and protruded toward the surface to be cooled within the flow channel or on the surface to be cooled is installed so as to have a function of reducing a pressure generated upon the collapse of the coalesced bubble.

A cooling method by microbubble emission boiling, comprising using a surface of an object to be cooled or a surface of a heat-transfer member coming into close contact with the surface of the object to be cooled as a surface to be cooled, causing a subcooled cooling liquid to flow through a tubular flow channel provided on the surface to be cooled, growing bubbles generated by boiling of the cooling liquid on the surface to be cooled, which is heated, and condensing and collapsing a coalesced bubble formed in a contacted state so as to cover the surface to be cooled by the cooling liquid to make heat flux heat removal at a temperature higher than a temperature, at which a critical heat flux is obtained, wherein as the tubular flow channel, a flow channel structure that the surface to be cooled forms a part of and the same plane as an inner wall of the flow channel, and which has plural convex members fixed to the inner wall of the tubular flow channel and protruded toward the surface to be cooled within the flow channel or on the surface to be cooled is used, and the condensation and collapse are conducted in a state that at least part of the convex members are entered into the coalesced bubble, thereby reducing a pressure generated upon the collapse of the coalesced bubble.

A cooling apparatus by microbubble emission boiling, which is a boil cooling apparatus used in a cooling method by microbubble emission boiling, comprising using a surface of an object to be cooled or a surface of a heat-transfer member coming into close contact with the surface of the object to be cooled as a surface to be cooled, causing a subcooled cooling liquid to flow through a tubular flow channel provided on the surface to be cooled, growing bubbles generated by boiling of the cooling liquid on the surface to be cooled, which is heated, and condensing and collapsing a coalesced bubble formed in a contacted state so as to cover the surface to be cooled by the cooling liquid to make heat flux heat removal at a temperature higher than a temperature, at which a critical heat flux is obtained, wherein a flow channel structure that the surface to be cooled forms a part of and the same plane as an inner wall of the flow channel, and which has plural convex members fixed to the inner wall of the tubular flow channel and protruded toward the surface to be cooled within the flow channel or on the surface to be cooled is installed so as to have a function of reducing a pressure generated upon the collapse of the coalesced bubble.