Heat transfer device

Abstract

A heat transfer device includes an elongated container having an inner wall; a wick structure arranged on the inner wall of the container; a working fluid received in the container, the working fluid containing a liquid medium and a plurality of magnetic particles dispersed in the liquid medium; and at least one alternating magnetic field generator configured for applying an alternating magnetic field to the magnetic particles.

1 . A heat transfer device comprising: 
 an elongated container having an inner wall;    a wick arranged on the inner wall of the container;    a working fluid received in the container, the working fluid containing a liquid medium and a plurality of magnetic particles dispersed in the liquid medium; and    at least one alternating magnetic field generator configured for applying an alternating magnetic field to the magnetic particles.    
   
   
       2 . The heat transfer device as claimed in  claim 1 , wherein the liquid medium is selected from the group consisting of water, ammonia water, methanol, alcohol, acetone, and heptane.  
   
   
       3 . The heat transfer device as claimed in  claim 1 , wherein the magnetic particles contain a material selected from the group consisting of iron, cobalt, nickel, and any appropriate alloy of these materials.  
   
   
       4 . The heat transfer device as claimed in  claim 1 , wherein the magnetic particles have an average particle size in the range from 1 to 100 nanometers.  
   
   
       5 . The heat transfer device as claimed in  claim 1 , wherein the magnetic particles have a percentage by weight in the range from 0.1% to 3% in the working fluid.  
   
   
       6 . The heat transfer device as claimed in  claim 1 , wherein the working fluid further contains a stabilizing agent.  
   
   
       7 . The heat transfer device as claimed in  claim 6 , wherein the stabilizing agent contains a material selected from the group consisting of citric acid, citrate, polyvinyl alcohol, and polyvinyl pyrrolidine.  
   
   
       8 . The heat transfer device as claimed in  claim 1 , wherein the alternating magnetic field generator comprises an alternating current power source, and a coil of wire surrounding the container, the coil being electrically connected to the alternating current power source.  
   
   
       9 . The heat transfer device as claimed in  claim 1 , wherein the alternating magnetic field generator comprises an alternating current power, an iron core, and a coil of wire surrounding the iron core, the coil being electrically connected to the current power source.  
   
   
       10 . The heat transfer device as claimed in  claim 1 , wherein the at least one alternating magnetic field generator is disposed adjacent to the container, and is configured for applying the alternating magnetic field to the magnetic particles along a direction substantially parallel to a longitudinal direction of the container.  
   
   
       11 . The heat transfer device as claimed in  claim 1 , wherein the at least one alternating magnetic field generator comprises a plurality of the alternating magnetic field generators, the alternating magnetic field generators are symmetrically disposed around the container.