Screening device for preparing nanofluids and method for preparing nanofluids

Abstract

The invention discloses a screening device for preparing nanofluids. The screening device for preparing the nanofluids comprises a flow channel, a fixed screen plate, a dynamic screen plate, an upper peristaltic pump and a lower peristaltic pump, wherein the dynamic screen plate is closely adhered on the fixed screen plate; screen holes in the fixed screen plate are aligned with screen holes in the dynamic screen plate; the circumferential size of the fixed screen plate is equal to the circumferential size of the flow channel; the circumferential size of the dynamic screen plate is less than the circumferential size of the flow channel; gaps are formed in the dynamic screen plate; grooves are formed in the upper part of the fixed screen plate; the gaps in the fixed screen plate correspond to the grooves in the fixed screen plate; the dynamic screen plate and the fixed screen plate divide the flow channel into an upper layer flow channel located above the dynamic screen plate and a lower layer flow channel located below the fixed screen plate; the upper peristaltic pump is connected with two ends of the upper layer flow channel; and the lower peristaltic pump is connected with two ends of the lower layer flow channel. The screening device can remove poorer-dispersity nano-agglomerates parts contained in nano-particles; meanwhile, the invention also discloses a method for preparing the nanofluids; and with the adoption of the method, obtaining of the mass fraction of required nano-particles can be guaranteed and the dispersity of the nanofluids can be improved.

Description

technical field [0001] The invention relates to a preparation device and method for nanofluid, in particular to a screening device for preparing nanofluid and a method for preparing nanofluid. Background technique [0002] Nanofluids are considered to have the potential to improve the energy efficiency of heat transfer systems. However, nanopowders suspended in nanofluids will agglomerate and settle, making nanofluids gradually degenerate into ordinary fluids. Therefore, the preparation of nanofluids is the basis and key step for the application of nanofluids in the field of engineering fluids, and minimizing the agglomeration and sedimentation of nanopowders in nanofluids is the main task of using nanofluids as working fluids. The preparation method of nanofluid is divided into "one-step method" and two-step method. The one-step method is to complete the preparation process of nanoparticles and the dispersion process of nanoparticles in the base liquid at the same time. ...

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Problems solved by technology

For the two-step method of preparing nanofluids, most of them use direct addition at present, and then use external dispersion methods, including dispersants, ultrasonic water baths, etc., but these methods are also difficult to disperse the agglomerated nanoparticle clusters.

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