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Definition: DRAG FORCE. Drag Force \(F_D\) is found to be proportional to the square of the speed of the object. Mathematically \[F_D\propto v^2 \] \[F_D = \dfrac{1}{2} C_{\rho} Av^2, \] where \(C\) is the drag coefficient \(A\) is the area of the object facing the fluid, and \(\rho\) is the density of the fluid.
The drag force, F D, can be expressed in terms of a drag coefficient, C D, the effective body area, A, normal to the flow, and the dynamic pressure, (rU 2 /2): F D = C D A(rU 2 /2). This expression indicates that the drag on a given body increases as the square of its speed with respect to the fluid, as shown in the diagram.
28 Δεκ 2023 · Stoke's Law. Viscous Drag. Viscous drag is defined as. the frictional force between an object and a fluid which opposes the motion between the object and the fluid. Viscous drag is calculated using Stoke’s Law; F = 6πηrv. Where. F = viscous drag (N) η = coefficient of viscosity of the fluid (N s m −2 or Pa s) r = radius of the object (m)
2 Φεβ 2023 · Unit of drag force: Newton or N. Dimension of drag force: MLT-2. The above equation applies to almost all fluids. As can be seen, F D is proportional to the square of the velocity, i.e., F D ∝ v 2. This relationship is quadratic, and hence, the equation is also called quadratic drag force.
Drag force is a function of shape geometry, velocity of the moving fluid over a stationary shape, and the fluid properties density and viscosity. It can be calculated using the following equation, = Equation 1: Drag force equation using total profile. where . ρ is density determined from Table A.9 or A.10 in your textbook.
Drag force FD F D is proportional to the square of the speed of the object. Mathematically, FD = 1 2CρAv2, (6.7.2) (6.7.2) F D = 1 2 C ρ A v 2, where C C is the drag coefficient, A A is the area of the object facing the fluid, and ρ ρ is the density of the fluid.
Drag force can be broken into two types: form drag and skin drag. Form drag is caused by the resistance of fluids (liquids or gases) to being pushed out of the way by an object in motion through the fluid.
