# flow equation

## flow equation

[′flō i‚kwā·zhən]
(fluid mechanics)
Equation for the calculation of fluid (gas, vapor, liquid) flow through conduits or channels; consists of an interrelation of fluid properties (such as density or viscosity), environmental conditions (such as temperature or pressure), and conduit or channel geometry and conditions (such as diameter, cross-sectional shape, or surface roughness).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"Flow Equation Approach to Periodically Driven Quantum Systems"
DC power flow equation is linearization method, however it has neither enough accuracy nor show what is happening in the line loss.
[14,15] figured out the flow equation of viscoelastic fluid in micro porethroats and numerical solution of flow field, including velocity field and stress field, with upper-convected Maxwell constitutive equation, compared the flooding force on residual oil by different viscoelastic flooding fluids and corresponding residual oil deformation, and obtained hydrodynamic mechanism of elastic flooding of residual oil drop.
A complete theory of groundwater flow when rainfall infiltrates unsaturated zones can be described using either the variably saturated flow equation or the generalized Richards equation.
The main objective of the OPF problem is to optimize a chosen objective function such as fuel cost, voltage profile improvement, voltage stability enhancement, through optimal adjustment of power system control variable while at the same time satisfying system operation condition with power flow equation and inequality constraints [1-4].
In fact, they say, the solution of the non-linear flow equation leads to a diagonalization of Hamiltonian operators in boson quantum field theory that are quadratic in the field.
A solution [bar.g](t) of the Ricci flow equation (4) is called "Ricci soliton" if there exists a positive function [phi](t) and a 1-parameter family of diffeomorphisms [psi](t) : [bar.M] [right arrow] [bar.M] such that [bar.g](t) = [phi](t)[psi][(t).sup.*][bar.g](0), where f'(t) = -2A for a constant A.
The flow equation is based on the step structure of the cushion structure.
Technicians can be proactive in avoiding issues by seeing how each data point fits into an overall flow equation. Field technicians can play a larger decision-making role.
If the mean velocity and area at the hood face can be ascertained, then the basic flow equation can be solved [Q = U A] (ACGIH, 2004).

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