METHOD OF FEEDING MICRODROPLETS OF LIQUID ONTO HEATED SURFACE OF SOLID BODY Russian patent published in 2024 - IPC F28C3/08 

FIELD: various technological processes.

SUBSTANCE: invention relates to drop microfluidics, hydrodynamics and heat exchange in two-phase and disperse systems, as well as cooling of electronic equipment. In particular, the invention describes a new method of creating a stream of liquid microdroplets of various sizes and different densities, including highly rarefied up to single drops, which under the action of super-intense evaporation in the area of the gas-liquid-solid contact line and gravity can be directed to the solid surface. When dosing and transferring microamounts of liquid, the effect of levitation of liquid microdroplets is used, which is caused by thermal action on the reservoir with liquid-donor. Objective of the proposed invention is to increase the efficiency of the device for feeding drops onto a heated surface, by ensuring the stability of the dry spot, expanding the range of used liquids, as well as providing a process of interaction of liquid microdroplets with a heated surface of a solid body. Set task is solved by the fact that in the method of feeding microdroplets of liquid onto the heated surface of a solid body, in which on a substrate heated by a heating element, liquid is supplied, in a horizontal heated thin layer of liquid a dry spot is formed, wherein to stabilize the dry spot on the surface of the substrate, microgrooves are formed, according to the invention, the heating element is divided into a heating element for a liquid and a heating element for a dry spot, so that the dry spot and the liquid layer have different temperatures and heat flows, wherein the heating elements are separated by thermal decoupling, and the angle between the plane of the substrate and the side of the microgroove ranges from 45 to 180 degrees. Microgroove cross-section shape can be triangular, rectangular and dovetail.

EFFECT: invention simplifies the process of feeding microdroplets of liquid onto the heated surface of a solid body and makes it controlled.

4 cl, 3 dwg