Question

Velocity head is the mechanical energy of a fluid per unit weight of the fluid measured relative to the bottom of the channel.
a. True
b. False

Answer 1

Answer:

b. False

Explanation:

The Bernoulli's equation is given by;

$P + \rho gh + \frac{1}{2} \rho v^2 = constat$

Divide through by the density of the fluid and acceleration due to gravity (ρg), to obtain energy per unit weight of the fluid known as head;

$\frac{P}{\rho g} + h + \frac{v^2}{2g} = constant$

where;

$\frac{P}{\rho g}$ is pressure head

h is datum head (mechanical energy due to height of the fluid)

$\frac{v^2}{2g}$ is velocity head (mechanical energy due to velocity of the fluid)

Thus, the mechanical energy of a fluid per unit weight of the fluid, measured relative to the bottom of the channel is datum head.

The correct option is "b. False"