What is meant by specific energy?
Specific energy or massic energy is energy per unit mass. It is also sometimes called gravimetric energy density, or just energy density though energy density more precisely means energy per unit volume.
How do you calculate specific energy density?
Energy density is equal to 1/2*C*V2/weight, where C is the capacitance you computed and V should be your nominal voltage (i.e 2.7 V).
How do you calculate the specific energy of water?
- 1] Specific energy (E) E=h+v22g. =1.2+1.562528×9.81. = 1.2 + 0.124. [ E = 1.324m]
- 2] Critical path (hc) hc=(q2g)1/3. =(1.87529.81)1/3. = 0.71 m.
- Critical velocity (vc) Vc=√9×hc. √9.81×0.71. [Vc = 2.639 m/s]
- 3] Minimum specific energy (E min) Emin=3hc2. = 3×0.712. [ Emin = 1.065m]
What is specific energy in fluid mechanics?
Specific energy is the total head with respect to the channel bottom. It is a summation of the velocity head and the depth of flow at a given cross section.
How do you calculate volume per unit of energy?
$E = {i^2}Rt$ joule. Now as we know that the unit of the volume is ${m^3}$ or $c{m^3}$ both dimensions are equal which is given as [L]. So the dimension of energy per unit volume is = $dfrac{{left[ {M{L^2}{T^{ – 2}}} right]}}{{left[ {{L^3}} right]}} = left[ {M{L^{ – 1}}{T^{ – 2}}} right]$.
How do you calculate alternate depth?
The depths of flow can be either PR = y1 or PR` = y`1. These two possible depths having the same specific energy are known as alternate depths.
How do you calculate the specific energy of a supercapacitor?
According to the equations of P=ΔV2/(4Rm) and E=1/2 CΔV2, the power density (P) and the energy density (E) of supercapacitors can be improved by reducing the equivalent series resistance (R) and increasing the operating potential window (ΔV) as well as specific capacitance (C), respectively.
How do you calculate energy in joules?
If you multiply the number of watts by the number of seconds, you’ll end up with joules. To find out how much energy a 60W light bulb consumes in 120 seconds, simply multiply (60 watts) x (120 seconds) = 7200 Joules.
What is specific energy and specific power?
Specific power is power per unit mass, and specific energy is energy content per unit mass.
What is the specific energy diagram?
The specific energy diagram is specific to the unit discharge for a given flow rate.
What is the equation of the specific energy curve *?
Write pressure in terms of depth (y = p / γ). = 0). i.e. where y is the depth of flow, v is the velocity, Q is the discharge, A is the cross- sectional flow area and E is the specific energy i.e energy w.r.t channel bottom.
What are y1 and y2 in the specific energy curve?
What are y1 and y2 in the adjoining graph? Explanation: For a particular specific energy above the minimum specific energy there are two depths called as alternate depths.The specific energy of a rectangular channel having dimensions 2m×3m is 3.095m.
What is specific energy in a channel?
Specific energy is the total energy at a section w.r.t. the channel bed as datum and is expressed as summation of. flow depth and velocity head.
How is Froude number calculated?
It is generally expressed as Fr = v/(gd)1/2, in which d is depth of flow, g is the gravitational acceleration (equal to the specific weight of the water divided by its density, in fluid mechanics), v is the celerity of a small surface (or gravity) wave, and Fr is the Froude number.
When the specific energy is minimum depth of flow is?
critical depth
Explanation: The depth of flow at which the specific energy attains a minimum value is called the critical depth. The flow at critical depth is called critical flow and the velocity of flow known as the critical velocity.
How do you calculate total energy content?
The equation for calculating the energy content of a food source via calorimetry is as follows: Energy (joules) = Mass of water (g) × 4.2 (J/gºC) × Temperature increase (ºC)
What are the typical units for specific energy?
The SI unit for specific energy is the joule per kilogram (J/kg).
What is the difference between conjugate depth and alternate depth?
Alternate depths: For a given discharge Q in a channel, there will be two depths for a given specific energy. These two depths are known as alternate depths. Conjugate depths: The two depths corresponding to the depth of flow, before and after of hydraulic jump having same momentum flux are termed as conjugate depths.
What is alternative depth?
Alternate depths are defined as the depths of flow in open channels for which the specific energy is the same.The generalized solution/equation yields both alternate depths from the known value of the non-dimensional specific energy.
How do you calculate hydraulic jump?
Equations for Hydraulic Jump Calculations
y2/y1 = (1/2)[-1 + (1 + 8Fr12)1/2] ; V1 = Q/(by1) ; and Fr1 = V1/(y1g)1/2. The upstream velocity, V1 and upstream Froude number, Fr1, need to be calculated first, using the last two equations, then the downstream depth of flow, y2 can be calculated using the first equation.