What is the correct formula for loss due to sudden contraction?

What is the correct formula for loss due to sudden contraction?

Formation of eddies takes place between the vena contract and pipe wall. Head loss due to sudden contraction=head loss upto vena contracta + head loss due to sudden enlargement.

Which loss is more sudden expansion or sudden contraction?

Explanation: Loss Due To Sudden Expansion: It is a type of minor loss at the end of a pipe or when smaller diameter pips meet large diameter pipe due to sudden enlargement in the area of flow. It is larger than loss due to sudden contraction because Eddies are formed at the entrance of a large diameter pipe.

What is the value of head loss due to sudden contraction?

Entry Loss As , the value of K in the Eq. (14.29) tends to 0.5 as shown in Table 14.1.

What is contraction coefficient?

Coefficient of contraction is defined as the proportion between the areas of the stream at the vena contracta to the area of the orifice. The estimation of coefficient of contraction changes marginally with the accessible leader of the fluid, size, and state of the orifice.

What is contraction loss?

[kən′trak·shən ‚lȯs] (fluid mechanics) In fluid flow, the loss in mechanical energy in a stream flowing through a closed duct or pipe when there is a sudden contraction of the cross-sectional area of the passage.

What is the general value for coefficient of contraction *?

Explanation: the ratio of the area of a jet at vena contracta to the area of orifice is known as the coefficient of contraction. the value of cc varies from 0.61 to 0.69 for different orifices.

Why do we calculate coefficient of discharge?

This parameter is useful for determining the irrecoverable losses associated with a certain piece of equipment (constriction) in a fluid system, or the “resistance” that piece of equipment imposes upon the flow.

What is sudden enlargement?

If the cross-section of a pipe with fluid flowing through it, is abruptly enlarged (Fig. 14.2a) at certain place, fluid emerging from the smaller pipe is unable to follow the abrupt deviation of the boundary. The streamline takes a typical diverging pattern (shown in Fig. 14.2a).

How do you calculate minor loss coefficient?

Minor Loss Equation: g = acceleration due to gravity = 32.174 ft/s2 = 9.806 m/s2. hm = head loss due to a fitting and has units of ft or m of fluid. It is the energy loss due to a fitting per unit weight of fluid.

How to calculate coefficient of contraction for sudden contraction?

The Coefficient of contraction for sudden contraction formula is known while considering the loss of head due to sudden contraction and the velocity of flow at section 2-2 and is represented as Cc = V2/ (V2+sqrt(hc*2*[g])) or coefficient_of_contraction = Velocity at section 2-2/ (Velocity at section 2-2+sqrt(Loss of head sudden contraction*2*[g])).

When do you have an expansion or contraction loss?

Expansion / Contraction Losses Expansions are defined as when the flow in a pipe goes from a small area to a larger area and the velocity slows down. It is the exact opposite for contractions, the flow goes from a larger pipe to a smaller one and the velocity increases.

When does a sudden enlargement or contraction occur?

The resistance represents a sudden enlargement if fluid flows from inlet to outlet, or a sudden contraction if fluid flows from outlet to inlet. The block is based on the Local Resistance block. It determines the pressure loss coefficient and passes its value to the underlying Local Resistance block.

When does a pipe have a gradual contraction?

Gradual expansions or contractions are when the angle between the two pipe sizes is between 0 and 90 degrees. The k-value not only depends on the ratio of pipe sizes but for the angle as well. A gradual contraction is shown below in Figure-3. Figure-3: A diagram showing a gradual contraction of a pipe (neutrium.net).