8686 deflected spray nozzle with BSPT thread

8686 deflected spray nozzle with BSPT thread

【YBS Nozzle】offer 8686 deflected spray nozzle and other products.Tel:86-0769-81609791

Type 8686 differs the traditional hollow cone nozzles in the cap design style. 

Nozzle continuum method and the VOF method

Continuum methods compared with the VOF method

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??Compared with continuous medium VOF method , the method further includes a continuous medium in the model reflect the full flow cavitation mechanism ( such as the structure of the fluid itself , bubble dynamics , turbulence and white effect , etc. ) potential, and RANS (Reynold-Averaged Navier-Stokes) the amount calculated under the framework moderate. Thus in recent years, flow simulation study of cavitation in the conical nozzle continuum methods are widely use . Continuum methods usually assume cavitation flow gas-liquid two phases are interspersed with each other or penetration . When cavitation flow modeling , continuous fluid medium method proposed concept can be used

The gas-liquid mixture is processed into a continuous medium that is a single -fluid model , the concept can also be used in the gas-liquid phase separation into two separate continuous process medium , the two-fluid model .

????Single- fluid model of its points are as follows : a gas-liquid mixture is assumed the infinitesimal control volume into a completely homogeneous compressible flow medium. Its density is typically a function of the processing phase and the local density of the flow field of the sub- phase volume fraction . The mixture of pressure and velocity field meet Navier-Stokes equations . But the equations are not closed , it is because the volume fraction of each phase needs to solve . Depending on the way the closure equations , single-fluid model has been reported broadly divided into two categories , as follows : First , the establishment of a gas-liquid mixture flow cavitation equation of state to be closed equations . The model -based approach is often called positive model (barotropicmodel). In the simulation of the flow of air nozzles , Schmidt et al , Qi and Dumont et al , who used similar to a closed positive relationship equations. Schmidt et al concluded that based on its value , positive model is very suitable for simulation of high-pressure diesel internal conical nozzle flow cavitation . In this study, positive relationships Schmidt , who used to re- derivation , but found that the

Positive relationship for gas-liquid density ratio of the local flow field with demanding and often require deviation from the normal density ratio under the conditions in order to obtain stable numerical solutions . Detailed derivation and analysis, see chapter III selection part of the model . Another point to be noted that these reported positive relationships are based on analysis of the phenomenon of gas-liquid mixtures derived , empirical strong , its accuracy to be further verified.

????Second , the establishment of the specified phase ( vapor phase typically ) the volume fraction or mass fraction of a closed transport equations equations. Derivation volume fraction or mass fraction transport equations based mass transfer of gas -liquid phase transition process , and usually with bubble dynamics equations ( or describe the growth of the bubble collapse ) associate . Study the specific derivation see Yuan et al and Singhal et al . Such a single-fluid model considers the bubble dynamics , which reflects some of the microscopic mechanism of single- fluid model cavitation flow to some extent been developed to take advantage of the single-phase flow solver to calculate the amount corresponding to the small and applicable to many irregular three-dimensional basin. Thus, the single- fluid model has been very widely used.

Ordering information of 8686 deflected spray nozzle(YBS nozzle)

Thread：B=BSPT

Materials：None=brass

                 SS=303 steel steel

 1/8 B1/88686-0.37 B1/88686-SS0.37

B1/88686-0.5 B1/88686-SS0.5

B1/88686-0.75 B1/88686-SS0.75

 1/4 B1/48686-1 B1/48686-SS1

B1/48686-1.5 B1/48686-SS1.5

B1/48686-2 B1/48686-SS2

B1/48686-2.5 B1/48686-SS2.5

 3/8 B3/88686-3 B3/88686-SS3

B3/88686-3.5 B3/88686-SS3.5

B3/88686-4 B3/88686-SS4

B3/88686-4.5 B3/88686-SS4.5

B3/88686-5 B3/88686-SS5