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2020-8-6 · = peak frequency, Hz 41b = bandwidth of the frequency band, Hz LWb = sound pow'er level in the band centered on frequency b, dB (re I O Me = jet exit Mach number, Ue ae = nozzle mass flow rate, kg/s n = number of nozzles r = length of the radius line from the assumed position of the frequency source to the point on the vehicle r 3 = exit radius of individual nozzles
Get PriceNozzles are widely used to control the rate of flow, speed, direction, mass, shape and pressure of the stream in connection with many different engineering applications. This paper presents the performance predicted by a computational fluid dynamic
Get PriceA jet of gas containing irregular SiC particles with the sizes of 255335µm was ejected from a nozzle of 5mm diameter, which then impinged on the test specimen located 30mm away from the nozzle. The impingement flow speed was adjusted by air pressure and it was determined using the rotating double-disk method.19) The eroded specimens were
Get PriceOral Precautions. With masks, being a mandatory precaution during this pandemic active sanitization of inspired and expired air is required. Huang et al. suggested chemical modulation of respiratory exhales to impregnate the virion-laden droplets with anti-viral/sanitizing molecules.Panda et al. propose a modified anatomical facemask that clubs heat and moisture exchanger bacterial/viral ...
Get Price2019-1-20 · using an abrasive water jet. The hydraulic fracturing method, shown in Figure 1, uses a conveying device to push a coiled tubing or a drill pipe with the directional abrasive water jet nozzle from the top to the bottom of the hole and uses the abrasive water jet to cut down the double …
Get Price2015-4-2 · 采用RNG k - ε 模型并结合壁面函数对不同占空比的双喷嘴狭缝冲击射流强化传热进行数值模拟，以定性评价占空比对多喷嘴冲击射流强化传热的影响，通过计算分别得到了不同占空比、相位差以及射流频率条件下射流冲击传热的效果。研究表明：在相同的雷诺数和相位差θ为0°的情况下，由于非 ...
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