Sprdr- heat spreader- tailorable, flexible, passive

[See FIGS. 14+, 11-13, 21-26, 43-48, 62-75] A heat spreader, for transferring heat from an heat source, CC, to a heat dissipating device, HDD,

• a) said heat source, generating a large amount of heat, W0 Watts, exiting from the heat source at a heat source exit area, having a heat source exit surface area, A0 cm2, creating a large heat source flux, F0, being generally calculated as being equal to W0/A0 Watt/cm2,
• b) said heat dissipating device, HDD, comprising at least one of the following group of cooling elements, including solid finned heat sinks, heat pipes, vapor chambers, cooling/refrigerating units,
• c) said heat spreader comprising at least
• d) a number of heat conducting elements, generally flexible and shaped as columns,
• e) each one of these columns having an elongated body, with a foot at the lower end of the column and a head at the opposite end of the column,
• f) said foot of each column having a small foot cross section, with a small foot surface area compared to the larger surface area, A0 cm2, of the heat source exit surface area, and
• g) a platform, proximate the head of the columns,
• h) wherein
• i) said foot of each column is attached to the heat source exit area and
• j) said head of each column is attached to the platform, and
• k) wherein
• l) said platform has a large platform surface area, A1 cm2, larger than the heat exit surface area, A0 cm2 of the heat source,
• m) and wherein
• n) the heat is transferred from the heat source, through the columns, to the platform and from the platform large surface area, A1, to the heat dissipating device, HDD
• o) resulting in that
• p) the heat flux, F1, at the surface of the platform large surface area, A1, is smaller than the heat flux, F0, at the heat exit surface area, A0, and
• q) wherein
• r) this F1 heat flux can generally be calculated as being equal to the heat flux, F0, multiplied by the inverse ratio of the large platform surface area, A1 cm2, with respect to the heat exit surface area, A0 cm2,
• s) or in other words,
• t) F1 will be equal to F0 multiplied by (A0/A1),
• u) so for example,
• v) if A0 is 1 cm2 and A1 is 4 cm2, and F0 is 300 Watts/cm2, then F1 will be equal to [F0×(A0/A1)]=[300×(¼)]=75 Watts/cm2.

[See FIGS. 78 and 79] In a two-phase flat heat pipe chamber, similar to the devices known in the industry as Therma Base or Therma Vapor Chamber or Flat Plate Heat Pipe, used for cooling various devices, wherein

• a) said heat pipe chamber is generally shaped as a shallow box, with six sides, one bottom or floor side, one top or cover side and four walls, wherein
• b) the floor and the cover sides are large compared to the other four walls, which are generally shorter, and wherein
• c) said shallow box is generally empty inside, except that the inside walls and/or surfaces of the box are covered with sintered particles or material, which act as wicks or wicking features, and wherein
• d) most of the wicks are spread and stuck along the inside surfaces of the Heat Pipe Chamber and wherein
• e) there usually is some empty room or space away from the walls, where some additional wicking material can be added without obstructing or overcrowding the space inside the box,
• f) the improvement comprising
• g) the step of providing at least some additional sintered material, say along the central location of the floor or the cover, and preferably away from the narrow side walls of the flat heat pipe, to create at least one additional wicking element, in that empty room, to enhance the flow of the heat transferring fluids, and wherein
• h) said sintered material can be shaped as a line or a bead or a mound, or a row, like the raised dirt lines or mounds along a plowed field, wherein
• i) such an additional mound of sintered material could enhance the heat transfer process of such a two-phase heat pipe chamber, for example, these mounds can enhance the transfer of heat from one end of the two-phase heat pipe chamber to the other end.