# specific energy equation

h a = (p 2 - p 1) / γ + (h 2 - h 1) + (v 2 2 - v 1 2) / 2 g (1). variables as, The sum of the three terms is called the total head H, which remains constant: We use cookies to help provide and enhance our service and tailor content and ads. Scribd will begin operating the SlideShare business on December 1, 2020 A special case involves a horizontal pipe where there is no change in the elevation z; then a simplified Bernoulli equation takes the form. For uniform flow, the specific energy of a channel will be constant when the depth and width of the channel remain constant (y and v will then be constant). Specific energy at a cross-section is, Specific Energy is normally used for open channels. g = acceleration due to gravity = 32.174 ft/s 2 = 9.806 m/s 2. As shown in Fig. 1. Chapter 5 specific energy E1. g Pallippattu Krishnan Vijayan, ... Naveen Kumar, in Single-Phase, Two-Phase and Supercritical Natural Circulation Systems, 2019, For a closed loop, ∮dv=0and hence∮dv*=0,∮dP=0and∮dz=0. For more details, see Bejan (1995), Kaviany (1995), Hossain and Pop (1997), Nield (2000, 2002) and Ingham (2004), and for the thermal non-equilibrium model Baytas (2003). Since V = Q/A, the Specific Energy Equation can also be written as: Lastly since the area of a rectangular channel can be taken as b*h you can... About WikiEngineer | The Disclaimer | Advertise With Us | Wiki InformationCopyright © 2008-2013 Redefinethe.Net, E = y + \frac{Q^2}{2g(bh)^2} \quad \text{ [Rectangular Channels]}, H. Chanson, "The Hydraulics of Open Chanel Flow: An Introduction (2nd Edition)", 2004. In cylindrical coordinates centered on the pipeline cross-section, the heat equation is then written as: Equation 4.5. Therefore, for each specific part of the electrode or battery, an averaged property should be obtained by applying the following equation, where s and e show the solid and electrolyte phases: where the sum over s is carried on all different available solid species. For the adiabatic hot leg, the dimensionless enthalpy is same as ih* or in other words, Integrating the equation for the cooler, and using the boundary condition that at s=shl,i*=ihl* gives, Using the boundary condition that at s=sc,i*=icl* in the above equation yields, Since the pipes are considered to be adiabatic, Qh=Qc. Be aware that this nominal ratio is given for standard test conditions (STC) : radiation=1000 W/m2, cell temperature=25 celcius degree, Wind speed=1 m/s, AM=1.5. Consequently, in high-power applications, the assumption of constant temperature during discharge cannot be that reasonable. 2. (5.6), allows elimination of the associated terms, and leads to the following simplified form of the energy equation, Wilfried Roetzel, ... Dezhen Chen, in Design and Operation of Heat Exchangers and their Networks, 2020. Georgia Asistin, Andrei Dita, Glenn Manalese, Evangeline Niez, Jerom Sarol, Nikko Togores Institute of Civil Engineering, University of the Philippines - Diliman November 6, 2014. Eq. Also, the friction between water and pipe increases, so that the water velocity and headloss have a direct relation (Figure 5.1). (7.23) accounts for conduction heat transfer or Fourier heat transfer inside different parts of the cell. Derivation of the Specific Energy Equation. E = Constant = E1 → E1 = f (y,Q) Clipping is a handy way to collect important slides you want to go back to later.