Reynolds number
... also be expressed in common Imperial units like • Re = 7745.8 u dh / ν (2a) • where • Re = Reynolds Number (non dimensional) • u = velocity (ft/s) • dh = hydraulic diameter (in) • ν = kinematic viscosity (cSt) (1 cSt = 10-6 m2/s ) ...
... also be expressed in common Imperial units like • Re = 7745.8 u dh / ν (2a) • where • Re = Reynolds Number (non dimensional) • u = velocity (ft/s) • dh = hydraulic diameter (in) • ν = kinematic viscosity (cSt) (1 cSt = 10-6 m2/s ) ...
MMV211, March 9, 2005 P1. The figure below shows a vane with a
... Given: water, 40◦ C; θ = 60◦ ; A = 30 cm2 ; V = 30 m/s (jet); U = 10 m/s (vane). Sought: horizontal braking force, Rx Consider a control volume (CV) that is fixed to the moving vane, which means that the flow through CV can be considered to be stationary; liquid flow means incompressible flow. Let c ...
... Given: water, 40◦ C; θ = 60◦ ; A = 30 cm2 ; V = 30 m/s (jet); U = 10 m/s (vane). Sought: horizontal braking force, Rx Consider a control volume (CV) that is fixed to the moving vane, which means that the flow through CV can be considered to be stationary; liquid flow means incompressible flow. Let c ...
Document
... f(t) – Volume flow rate, Q(t) Momentum, p = e.dt = Pp, integral of pressure Displacement, q = Q.dt = V, volume of flow Power, P(t).Q(t) Energy (kinetic): Q(t).dPp Energy (potential): P(t).dV Fluid Port: a place where we can define an average pressure, P and a volume flow rate, Q Exam ...
... f(t) – Volume flow rate, Q(t) Momentum, p = e.dt = Pp, integral of pressure Displacement, q = Q.dt = V, volume of flow Power, P(t).Q(t) Energy (kinetic): Q(t).dPp Energy (potential): P(t).dV Fluid Port: a place where we can define an average pressure, P and a volume flow rate, Q Exam ...
Modelling Two
... Two-phase flows of liquid and gas can be found in many kinds of industrial processes, such as chemical reactors, oil- and gas pipe lines and water disposal lines. Often these processes contain a stratified flow regime (where the lighter gas flows on top of the heavier fluid), and an unstable phase w ...
... Two-phase flows of liquid and gas can be found in many kinds of industrial processes, such as chemical reactors, oil- and gas pipe lines and water disposal lines. Often these processes contain a stratified flow regime (where the lighter gas flows on top of the heavier fluid), and an unstable phase w ...
Fluid Mechanics Sample Exam 1 Please work at least three
... a) Roughly speaking, and without doing any calculation, how large would you estimate the Reynolds number to be when the flow starts to transition from laminar to turbulent flow? Hint: Consider laminar-to-turbulent transition in circular pipes. b) Focusing on the entry length region (over which bound ...
... a) Roughly speaking, and without doing any calculation, how large would you estimate the Reynolds number to be when the flow starts to transition from laminar to turbulent flow? Hint: Consider laminar-to-turbulent transition in circular pipes. b) Focusing on the entry length region (over which bound ...
4.2 Fluid Friction Notes
... The fluid pressure in the wake is less than the fluid pressure in the flow. The lower pressure in the wake causes a force to act on the object (boat or car) in the opposite direction to its velocity. This pressure difference in a wake is called pressure drag. Frictional drag and pressure drag b ...
... The fluid pressure in the wake is less than the fluid pressure in the flow. The lower pressure in the wake causes a force to act on the object (boat or car) in the opposite direction to its velocity. This pressure difference in a wake is called pressure drag. Frictional drag and pressure drag b ...
PPTX - University of Colorado Boulder
... • restoring force is proportional to displacement • force is not constant, so acceleration isn’t either: a = -(k/m)x • “amplitude” A is the maximum displacement xmax, occurs with v = 0 • mass oscillates between x = A & x = -A • maximum speed vmax occurs when displacement x = 0 • a “cycle” is the ful ...
... • restoring force is proportional to displacement • force is not constant, so acceleration isn’t either: a = -(k/m)x • “amplitude” A is the maximum displacement xmax, occurs with v = 0 • mass oscillates between x = A & x = -A • maximum speed vmax occurs when displacement x = 0 • a “cycle” is the ful ...
Types of Flow
... When a fluid is flowing in pipe, the countless small particles get together and form a flowing stream. These particles, while moving, group themselves in a variety of ways, e.g., they move in a regular formation, just as disciplined soldiers do; or they may swirl, like the individuals, in a disorder ...
... When a fluid is flowing in pipe, the countless small particles get together and form a flowing stream. These particles, while moving, group themselves in a variety of ways, e.g., they move in a regular formation, just as disciplined soldiers do; or they may swirl, like the individuals, in a disorder ...
AE 2350 Lecture Notes #5
... Fluid particles send out signals in the form of acoustic waves to the surrounding fluid, indicating their motion. If there is sufficient time for the sound waves to travel before the fluid particle arrives, the fluid particles downstream will “hear” the message and clear out. Otherwise, there will b ...
... Fluid particles send out signals in the form of acoustic waves to the surrounding fluid, indicating their motion. If there is sufficient time for the sound waves to travel before the fluid particle arrives, the fluid particles downstream will “hear” the message and clear out. Otherwise, there will b ...
Chap 4-che 312
... - For each particular shape of object and orientation of the object with the direction of the flow, a relation of Cd vs Re exists. ...
... - For each particular shape of object and orientation of the object with the direction of the flow, a relation of Cd vs Re exists. ...
flowing fluids and pressure variation!
... Turbulence is associated with intense mixing and unsteady flow.! ...
... Turbulence is associated with intense mixing and unsteady flow.! ...
Why do things move?
... • Reduced pressure above the wing results in a net upward force due to pressure change called “lift”. (Demo: paper leaf) • A biker also has swollen jacket when going fast due to low external pressure! • In aircraft design have shape of wing and “angle of attack” variations that effect total lift. ( ...
... • Reduced pressure above the wing results in a net upward force due to pressure change called “lift”. (Demo: paper leaf) • A biker also has swollen jacket when going fast due to low external pressure! • In aircraft design have shape of wing and “angle of attack” variations that effect total lift. ( ...
Turbulence
In fluid dynamics, turbulence or turbulent flow is a flow regime characterized by chaotic property changes. This includes low momentum diffusion, high momentum convection, and rapid variation of pressure and flow velocity in space and time.Flow in which the kinetic energy dies out due to the action of fluid molecular viscosity is called laminar flow. While there is no theorem relating the non-dimensional Reynolds number (Re) to turbulence, flows at Reynolds numbers larger than 5000 are typically (but not necessarily) turbulent, while those at low Reynolds numbers usually remain laminar. In Poiseuille flow, for example, turbulence can first be sustained if the Reynolds number is larger than a critical value of about 2040; moreover, the turbulence is generally interspersed with laminar flow until a larger Reynolds number of about 4000.In turbulent flow, unsteady vortices appear on many scales and interact with each other. Drag due to boundary layer skin friction increases. The structure and location of boundary layer separation often changes, sometimes resulting in a reduction of overall drag. Although laminar-turbulent transition is not governed by Reynolds number, the same transition occurs if the size of the object is gradually increased, or the viscosity of the fluid is decreased, or if the density of the fluid is increased. Nobel Laureate Richard Feynman described turbulence as ""the most important unsolved problem of classical physics.""