Discharge velocity

Example 6 Losses with Fittings and Valves It is desired to calculate the liquid level in the vessel shown in Fig. 6-15 required to produce a discharge velocity of 2 m/s. The fluid is water at 20°C with p = 1,000 kg/m and i = 0.001 Pa - s, and the butterfly valve is at 6 = 10°. The pipe is 2-in Schedule 40, with an inner diameter of 0.0525 m. The pipe roughness is 0.046 mm. Assuming the flow is tiirhiilent and taking the velocity profile factor (X = 1, the engineering Bernoulli equation Eq. (6-16), written between surfaces 1 and 2, where the... 

An impeller with a high fluid head is one with high peripheral velocity and discharge velocity. Such impellers are useful for (I) rapid reduction of concentration differences in the impeller discharge stream (rapid mixing), (2) production of large interfacial area and small droplets in gas-hquid and immiscible-liquid systems, (3) sohds deagglomeration, and (4) promotion of mass transfer between phases. 

Greatly increased possibility of hot air recirculation, due to low discharge velocity from the sections and absence of stack. 

Figure 5-22. Discharge velocity vector triangle showing the effect of slip.

Nozzle Diameter, d Nozzle exit diameter will be equal to or less than the diameter of the line feeding the tank. For a known flow rate of fluid supplied to the jet, the diameter is set by the largest size that will satisfy the requirement that the jet be turbulent or will satisfy the nozzle discharge velocity requirement (if the jet is denser than the tank liquid). For a turbulent flow requirement (both heavy and light jets) ... 

Heat release rate, tip diameter, gas discharge velocity. 

For the most common practical situation, when air is supplied by parallel jets from several diffusers placed in one plane and having the same outlet area Aq and discharge velocity Vq, the resulting velocity on the axis of the coalesced flow V.. can be found ... 

The initial discharge velocity is calculated according to formula (7.217) ... 

On-site containment measurements - made on a fume cupboard on a particularly exposed site showed that very large day-to-day variations in the degree of containment could be attributed to the wind blowing across the stack. A suitable design of stack termination and a high discharge velocity should reduce this problem. 

Air discharge velocity The average velocity of the air discharged from the opening of an ATD, V /(. ... 

Efflux velocity The discharge velocity of waste gases from the top of a stack. 

Substituting into equation 4.3, gives the discharge velocity ui ... 

Since the velocity of the metal at the ladle surface is very low (vf = 0), the metal discharge velocity is then given by... 

Figure 5.152. Discharge velocity as a function of steel level in ladle.

The problem for the designer is to determine the appropriate stack height. This is illustrated in Figure 25.34. This shows that the effective stack height is a combination of the actual stack height and the plume rise. The plume rise is a function of discharge velocity, temperature of emission and atmospheric stability3. 

Example B. Suppose in the previous example that the loss rate had been specified as not to exceed 40 lbs/hr. To minimize the increase in pressure drop accompanying any increase in inlet velocity necessary to reduce Dth to a value which would bring performance up to the desired level, it might be more expedient to instead increase the gas discharge velocity. 

The modifications are substituted into the mechanical energy balance (Equation 4-1) to determine u, the average discharge velocity from the leak ... 

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