# US 11,898,807 B2 · Single and multi-layer mesh structures for enhanced thermal transport

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- Number: US 11,898,807 B2
- Document ID: US11898807B2
- Status: Granted
- Kind: B2
- Application number: 17/689,081
- Filed: 2022-03-08
- Published: 2022-07-14
- Granted: 2024-02-13
- Earliest claimed: 2018-06-11
- Assignees: The Regents of the University of Colorado, a body corporate
- Applicants: The Regents of the University of Colorado, a body corporate
- Inventors: Ronggui Yang; Rongfu Wen; Shanshan Xu; Yung-Cheng Lee
- Web page: https://patentgrep.com/patent/US11898807B2

## CPC

- F28F 13/182: {especially adapted for evaporator or condenser surfaces (F28F13/187 takes precedence)}
- B01D 5/0027: {by direct contact between vapours or gases and the cooling medium}
- F25B 39/04: Condensers
- F28D 15/046: {characterised by the material or the construction of the capillary structure}
- F28F 13/185: {Heat-exchange surfaces provided with microstructures or with porous coatings}
- H10W 40/73: for cooling by change of state
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

This disclosure describes single and multi-layer woven meshes designed to enable sucking flow condensation and capillary-driven liquid film boiling, respectively, for instance, in use in heat spreaders. The single-layer woven meshes can include a nanostructure coating and a hydrophobic coating, while the multi-layer meshes can include a microcavity coating and optionally a hydrophilic coating.

## Claims

### Claim 1

A mesh system with gradient channels, the system comprising:
a multi-layer woven mesh with increasing mesh pore size bonded to a thermally conducting substrate and having a plurality of nano or microstructured features to increase boiling nucleation sites;
multi-layer interconnected microchannels formed within the mesh and between the mesh d the substrate for capillary liquid wicking; and
self-aligned gradient microchannels, each self-aligned gradient microchannel comprising mesh pores of increasing size extending away from the substrate to promote vapor and liquid to escape from the mesh system;
whereby a critical heat flux and a heat transfer coefficient are increased via capillary liquid film boiling enhancement with accelerated vapor escape for delaying surface dry out.

### Claim 2 (depends on 1)

The system of claim 1, wherein wires forming the mesh have a diameter of 20-100 μm and the wires are spaced by 10-500 μm.

### Claim 3 (depends on 1)

The system of claim 1, wherein the mesh comprises three or more layers.

### Claim 4 (depends on 1)

The system of claim 1, wherein the gradient microchannels have an opening angle between 30° and 90°.

### Claim 5 (depends on 1)

The system of claim 1, wherein the plurality of nano or microstructured features includes a group of shapes selected from a cavity, a pore, and a gap, and the plurality of nano or microstructured features have a height-to-width ratio larger than 2.

### Claim 6 (depends on 1)

The system of claim 1, further comprising a hydrophilic or hydrophobic coating on at least a portion of the mesh.