A Differential Addition Atomization Dispersion Method and Device for Preparation of Nanofluid

Abstract

The invention discloses a differential adding, atomizing and dispersing method and device for preparing nano fluid. The method comprises the following steps: mixing modified nano powder with base fluid to form nano additive liquor, atomizing the nano additive liquor to micro-level and submicron-level fog drops; then, spraying and contacting the fog drops by taking the base fluid as initial mother liquor, and carrying the fog drops into the mother liquor to form novel mother liquor; and finally preparing the nano fluid by taking the novel mother liquor as supplementing liquor of the atomized nano additive liquor. The device comprises an atomizing part and a liquid circulating part, wherein the atomizing part is used for atomizing the nano additive liquor to the micro-level and submicron-level fog drops; a liquid circulating pump in the liquid circulating part is used for pumping the mother liquor in a liquid storage unit to the top end of the liquid storage unit, so that the fog drops are sufficiently mixed with a sprayed mother liquor membrane, and refluxed in the mother liquor of the liquid storage unit; the additive liquid in an atomizing container is supplemented by the mother liquor in the liquid storage unit by a lower communicating pipeline. According to the method and the device, the dispersion efficiency of nano powder is improved, and the stability of the prepared nano fluid is improved.

Description

technical field [0001] The invention relates to a method and a device for uniformly dispersing nano-particles into a base liquid during the preparation of nano-fluid. Background technique [0002] Nanofluids have significant enhanced fluid heat and mass transfer effects and unique radiation absorption characteristics, which make them have huge potential application prospects in the fields of energy, chemical industry, automobiles, construction, and microelectronics. [0003] The preparation method of nanofluid can be divided into "one-step method" according to the way in which the nanoparticles are added to the base liquid. [0004] and the "two-step method". The "one-step method" combines the chemical preparation of nanoparticles with the preparation of nanofluids, avoiding the drying, calcination, storage and transportation of powders, which can not only reduce the formation of hard agglomerates, but also reduce the preparation cost of nanofluids. The obtained nanofluid ...

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Problems solved by technology

Usually, in the "two-step method" preparation process, measures such as adding a dispersant, changing the pH value of the fluid system, modifying the surface of the nano-powder, ultrasonic vibration, and stirring at a certain temperature are used to achieve the nano-particles in water, aqueous solution, alcohol or oil. However, due to the huge specific surface area and surface activity of nano-powders, during the preparation, storage, and transportation of nano-powders, the particles are easy to form agglomerates, agglomerate, and precipitate, thereby reducing the stability of nano-fluids , making it degenerate to ordinary fluids, which greatly weakens the effects of nanofluids on enhancing heat and mass transfer and radiation absorption.

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