Rovnoměrnost hustoty dopadající kapaliny při ostřiku povrchu tryskami v průmyslových aplikacích

IMPINGEMENT FLUX UNIFORMITY IN NOZZLE SPRAYING FOR INDUSTRIAL APPLICATIONS

journal article in Web of Science

en

The spray volume flux on the impingement or target surface from a nozzle is inherently not uniform even with a short impingement distance. A technique that only requires a special one-dimensional (1D) array arrangement of spray nozzles is developed to provide a uniform overall flux on a large impingement surface with the existing commercially available nozzles. Experiments and analyses were first conducted to assess how well the measured spray flux profiles can be correlated or fitted to a Gaussian function. The corresponding coefficient of determinations (R2) and standard deviations were specifically computed to quantify the deviation of the correlations or the data fitting accuracy. It was found that the measured spray flux data agreed extremely well with the Gaussian function. Based on this finding, the technique to assemble the overall flux profile from the 1D arrayed nozzles was analytically developed and experimentally illustrated. By adjusting the array pitch or nozzle spacing, the profile of the overall (overlapped) spray volume flux could be controlled and predicted. The uniformity criteria for assembling a uniform overall flux profile, including the threshold pitch, uniformity ratio, and flux peak intensity, were then analyzed and experimentally confirmed.

Objemový tok chladiva v dopadové oblasti trysek není rovnoměrný dokonce i v případě malých vzdáleností mezi tryskami. Byla vyvinuta metoda, která vyžaduje pouze 1D přístup a která zaručuje rovnoměrný celkový tok na rozsáhlých oblastech ostříkávaných kuželovými tryskami. Nejprve byla provedena měření, která ukázala jak je možné interpolovat rozložení toku z kuželové trysky Gaussovou funkcí. Bylo potvrzeno, že Gaussova funkce velmi dobře interpoluje toto rozložení. Na základě tohoto zjištění byla vyvinuta metoda, která umožňuje optimální návrh rozložení trysek tak, aby bylo dosaženo homogenních chladicích účinků.

The spray volume flux on the impingement or target surface from a nozzle is inherently not uniform even with a short impingement distance. A technique that only requires a special one-dimensional (1D) array arrangement of spray nozzles is developed to provide a uniform overall flux on a large impingement surface with the existing commercially available nozzles. Experiments and analyses were first conducted to assess how well the measured spray flux profiles can be correlated or fitted to a Gaussian function. The corresponding coefficient of determinations (R2) and standard deviations were specifically computed to quantify the deviation of the correlations or the data fitting accuracy. It was found that the measured spray flux data agreed extremely well with the Gaussian function. Based on this finding, the technique to assemble the overall flux profile from the 1D arrayed nozzles was analytically developed and experimentally illustrated. By adjusting the array pitch or nozzle spacing, the profile of the overall (overlapped) spray volume flux could be controlled and predicted. The uniformity criteria for assembling a uniform overall flux profile, including the threshold pitch, uniformity ratio, and flux peak intensity, were then analyzed and experimentally confirmed.

Kuželové trysky, hustota dopadu kapaliny, Gaussova funkce, objemový tok v impaktní oblasti, rovnoměrný ostřik, rovnoměrnost, objemový tok

full-cone nozzle, flow rate density, Gaussian function, impingement volume flux, spray volume flux, uniform spray, uniformity, volume flux

2013

14.10.2013

Begell House

USA

1044-5110

23

9

819–840

22