Device and method for a two phase heat transfer
AssigneeNational University of Singapore
InventorsPoh Seng Lee, Lee Liong Matthew Law
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Abstract
The invention provides a two phase heat transfer device comprising an inlet for receiving a heat transfer fluid, and; an array of heat transfer fins in spaced relation; primary spaces between said heat transfer fins defining primary channels parallel to a path from the inlet to outlet, and; oblique spaces between said heat transfer fins defining oblique channels arranged at an angle to said primary channels. It is preferable that walls defining the primary and oblique spaces provide nucleate boiling regions and the interruption of fully developed convective boiling regions when a heat transfer fluid is passed through the inlet to the outlet.
Claims15
A method of producing two phase flow in a heat transfer device comprising the steps of:
- passing a heat transfer fluid through an inlet of the heat transfer device;
- the heat transfer device having an array of heat transfer fins in spaced relation, primary spaces between the heat transfer fins defining primary channels parallel to a path from the inlet to an outlet, and oblique spaces between the heat transfer fins defining oblique channels arranged at an angle to the primary channels;
- wherein a temperature of the heat transfer fluid at the inlet is no greater than a saturation temperature of said heat transfer fluid;
- wherein the heat transfer device includes apertures between the oblique and primary channels, and further comprising the steps of:
- said apertures interrupting thin liquid-film formation;
- said thin liquid film continuously developing at a convective boiling region of said oblique channels, and
- wherein the critical heat flux within the device ranges from 56 W/cm2 and 120 W/cm2.
A method of producing two phase flow in a heat transfer device comprising the steps of:
- passing a heat transfer fluid through an inlet of the heat transfer device;
- the heat transfer device having an array of heat transfer fins in spaced relation, primary spaces between the heat transfer fins defining primary channels parallel to a path from the inlet to an outlet, and oblique spaces between the heat transfer fins defining oblique channels arranged at an angle to the primary channels;
- wherein a temperature of the heat transfer fluid at the inlet is no greater than a saturation temperature of said heat transfer fluid;
- wherein the heat transfer device includes apertures between the oblique and primary channels, and further comprising the steps of:
- said apertures interrupting thin liquid-film formation;
- said thin liquid film continuously developing at a convective boiling region of said oblique channels,
- wherein the critical heat flux within the device ranges from 56 W/cm2 and 120 W/cm2, and
- wherein a vapour quality at the outlet is between 0.5 and 0.988.
A method of producing two phase flow in a heat transfer device comprising the steps of:
- passing a heat transfer fluid through an inlet of the heat transfer device;
- the heat transfer device having an oblique-finned configuration comprising an array of heat transfer fins in spaced relation, primary spaces between the heat transfer fins defining primary channels parallel to a path from the inlet to an outlet, and oblique spaces between the heat transfer fins defining oblique channels arranged at an angle to the primary channels,
- wherein a temperature of the heat transfer fluid at the inlet is no greater than a saturation temperature of said heat transfer fluid,
- wherein the heat transfer device includes apertures between the oblique and primary channels,
- interrupting, by said apertures, thin liquid-film formation, wherein said thin liquid film continuously develops at a convective boiling region of said oblique channels;
- increasing bubble density by providing additional heat transfer area for bubbles to nucleate from surfaces of walls of said heat transfer fins;
- and
- shearing, at said apertures by the heat transfer fins, bubbles that nucleated from surfaces of walls of said heat transfer fins causing each of the bubbles to break into multiple, smaller bubbles, wherein the multiple, smaller bubbles generated in the oblique channels reduce pressure instabilities,
- wherein the critical heat flux within the device ranges from 56 W/cm2 and 120 W/cm2, and
- wherein the oblique-finned configuration of the heat transfer device has an extended vapour quality range at the outlet from 0.204 to 0.988.
Dependencies are inferred from the claim text.