## 81. The equation relating friction factor to Reynold number, $${{\text{f}}^{ - 0.5}} = 4{\log _{\text{e}}}{\left( {\frac{{{{\text{N}}_{{\text{Re}}}}}}{{\sqrt {\text{f}} }}} \right)^{ - 0.4}},$$ is called the __________ equation.

## 82. Friction produced by the formation of wakes is called the __________ friction.

## 83. Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid

## 84. What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta?

## 85. Sewage sludge is an example of the __________ fluid.

## 86. Non-colloidal solution is an example of the __________ fluid.

## 87. Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.

## 88. The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.

## 89. Gradually varying fluid flow is an example of __________ flow.

## 90. An ideal fluid is

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