Forced oscillatory flow type heat pipe and designing method for the same

A forced oscillatory flow type heat pipe having a heat pipe body with a closed loop flow path which meanders between a heat absorbing section and a heat radiating section, a liquid charged in said flow path and a mechanism causing an oscillatory flow of said charged liquid, wherein:

• phases of said oscillatory flows of said charged liquid in the adjacent passages of said meandering flow path is inverted;
• said charged liquid has a Prandtl number Pr of less than 100;
• and
• a modified Womersly number α is given within a certain range, where a motion coefficient η0, derived from the following equation, takes an approximately maximum value,
• the motion coefficient η0 being defined as
• η0[Pr, α]=MK[PR, α]2M72 [Pr, α].

A method for designing a forced oscillatory flow type heat pipe having a heat pipe body with a closed loop flow path which meanders between a heat absorbing section and a heat radiating section, a liquid charged in said flow path and a mechanism causing an oscillatory flow of said charged liquid,

• wherein phases of said oscillatory flows of said charged liquid in the adjacent passages of said meandering flow path being inverted,
• wherein said charged liquid has a Prandtl number Pr of less than 100 and a modified Womersley number α of 0.4 to 7, the modified Womersly number being defined as
• α=H(ω/K)1/2,
• where H(m) is half of a width of said flow path;
• ω (1/s) is angle frequency of oscillation;
• and is ε(m2/s) is heat diffusion coefficient of the charged liquid.