Heat transport device, electronic apparatus, and heat transport manufacturing method

Abstract

A heat transport device includes a working fluid, an evaporation portion, a condenser portion, a flow path portion, a concave portion, and a protrusion portion. The evaporation portion causes the working fluid to evaporate from a liquid phase to a vapor phase. The condenser portion communicates with the evaporation portion, and causes the working fluid to condense from the vapor phase to the liquid phase. The flow path portion causes the working fluid condensed in the condenser portion to the liquid phase to flow to the evaporation portion. The concave portion is provided on at least one of the evaporation portion and the flow path portion, in which the liquid-phase working fluid flows. The protrusion portion is made of nanomaterial protruding from an inner wall side surface of the concave portion such that the protrusion portion partially covers an opening surface of the concave portion.

1 . A heat transport device, comprising:
 a working fluid;   an evaporation portion causing the working fluid to evaporate from a liquid phase to a vapor phase;   a condenser portion communicating with the evaporation portion and causing the working fluid to condense from the vapor phase to the liquid phase;   a flow path portion causing the working fluid condensed in the condenser portion to the liquid phase to flow to the evaporation portion;   a concave portion provided on at least one of the evaporation portion and the flow path portion, in which the liquid-phase working fluid flows; and   a protrusion portion made of nanomaterial protruding from an inner wall side surface of the concave portion such that the protrusion portion partially covers an opening surface of the concave portion.   
     
     
         2 . The heat transport device according to  claim 1 ,
 wherein the nanomaterial is carbon nanotube.   
     
     
         3 . The heat transport device according to  claim 2 ,
 wherein the opening surface of the concave portion has a vapor flow path in which the vapor-phase working fluid flows, the vapor flow path being free from the protrusion portion; and   wherein the protrusion portion, a bottom surface of the concave portion facing the protrusion portion, and the inner wall side surface of the concave portion form a liquid flow path in which the liquid-phase working fluid flows.   
     
     
         4 . The heat transport device according to  claim 3 ,
 wherein the concave portion is groove-like.   
     
     
         5 . An electronic apparatus, comprising:
 a heat source; and   a heat transport device thermally connected to the heat source, the heat transport device including a working fluid, an evaporation portion causing the working fluid to evaporate from a liquid phase to a vapor phase, a condenser portion communicating with the evaporation portion and causing the working fluid to condense from the vapor phase to the liquid phase, a flow path portion causing the working fluid condensed in the condenser portion to the liquid phase to flow to the evaporation portion, a concave portion provided on at least one of the evaporation portion and the flow path portion, in which the liquid-phase working fluid flows, and a protrusion portion made of nanomaterial protruding from an inner wall side surface of the concave portion such that the protrusion portion partially covers an opening surface of the concave portion.   
     
     
         6 . A method of manufacturing a heat transport device including an evaporation portion causing a working fluid to evaporate from a liquid phase to a vapor phase, a condenser portion causing the working fluid to condense from the vapor phase to the liquid phase, and a flow path portion causing the liquid-phase working fluid to flow to the evaporation portion, comprising:
 forming a concave portion on a first base member;   producing a protrusion portion made of nanomaterial on an inner wall side surface of the concave portion of the first base member such that the protrusion portion partially covers an opening surface of the concave portion to obtain a second base member being at least one of the evaporation portion and the flow path portion;   forming a container with at least the second base member; and   introducing the working fluid to the container and sealing the container.