Grashof number


Also found in: Acronyms, Wikipedia.

Grashof number

[′gräs‚hȯf ‚nəm·bər]
(fluid mechanics)
A dimensionless number used in the study of free convection of a fluid caused by a hot body, equal to the product of the fluid's coefficient of thermal expansion, the temperature difference between the hot body and the fluid, the cube of a typical dimension of the body and the square of the fluid's density, divided by the square of the fluid's dynamic viscosity. Also known as free convection number.
References in periodicals archive ?
The average Nusselt number increases with decreasing magnetic field parameter or Schmidt number and decreases with increasing thermal or mass Grashof number.
Using the transformations (8a)-(8c) in equations (3)--(6) and ignoring terms of small orders in the Grashof number Gr we have,
Gr = Grashof number (A dimensionless number approximates the ratio of the buoyancy to viscous force acting on a fluid.
The velocity profiles for different values of Grashof number (Gr = 2, 10) are shown in Fig.
The effect of convection current on the velocity field is shown in figure (3) for different values of the Grashof number for heat transfer [G.
For the range of flow rates studied, the ratio of the largest Grashof number to the square of the smallest Reynolds number was 3.
It is also observed that the skin-friction decreases with increasing Grashof number.
Ryan Dygert: While an overall Grashof number can be defined for simple geometries such as flat plates and cylinders, due to the complex geometry of the seated manikin used in this study, an overall Gr cannot be unambiguously defined when the surface temperature is variable.
The data were predicted using an apparent diffusion coefficient model, which was correlated in terms of the liquid layer aspect ratio and of an equivalent Grashof number.
The effects of [beta], Grashof number G and Darcy number Da on the velocity field and Angular velocity are studied in detail.
As is well known, the Reynolds number (Re) is the most important dimensionless parameter for forced convection whereas the Grashof number characterizes the natural convection condition.
It is difficult to match the dimensionless parameters that govern air distribution in buildings, such as the Reynolds number and Grashof number, at the same time, between a scale model and an actual building.