What is the mechanical energy balance?
The mechanical energy balance is a type of energy balance that can tell us a great deal about simple flow systems. We begin with a discussion of conservation of energy and derive the mechanical energy balance (MEB). Finally, we show how to apply the MEB to simple flow systems.
What is mechanical energy in fluid mechanics?
The total mechanical energy of a fluid exists in two forms: potential and kinetic. The kinetic energy of the fluid is stored in static pressure, ps , and dynamic pressure, 12ρV2 1 2 ρ V 2 , where \rho is the fluid density in (SI unit: kg/m3) and V is the fluid velocity (SI unit: m/s).
What is flow work in thermodynamics?
Work is needed to push the fluid into or out of the boundaries of a control volume if mass flow is involved. This work is called the flow work (flow energy). The work done due to pushing the fluid element out of the control volume is the same as the work needed to push the fluid element into the control volume.
What is energy equation for steady flow of incompressible fluids?
(p/w) + (v2 / 2g) + z = Constant. (gauge) and with mean velocity of 2.0 m/s. find the total head or total energy per unit weight of the water at cross -section, which is 5 cm above the datum line.
What is material balance equation?
The material-balance equation is the simplest expression of the conservation of mass in a reservoir. The equation mathematically defines the different producing mechanisms and effectively relates the reservoir fluid and rock expansion to the subsequent fluid withdrawal.
At what flow velocity is the assumption of incompressible flow valid?
Validity of Incompressible Flows For external flows, especially air flow across a wing section, and other flows relevant to aerospace engineering, incompressible flow is valid for low speeds (M < 0.3).
What are the forms of mechanical energy of a fluid stream?
The forms of mechanical energy of a fluid stream are kinetic, potential, and flow energies.
What is the energy equation in PE?
The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
Is flow work different from displacement work?
Flow work is necessary for maintaining a continuous flow through a control volume. A control volume may involve one or more forms of work at the same time. Work-Energy transfer in thermodynamics under quasi static process is known as work displacement.
What is flow work or flow energy the flow work or flow energy is related to which term in the energy equation for open systems?
enthalpy
In an open flow system, enthalpy is the amount of energy that is transferred across a system boundary by a moving flow. This energy is composed of two parts: the internal energy of the fluid (u) and the flow work (pv) associated with pushing the mass of fluid across the system boundary.
