fluid transport mechanisms in microfluidic devices
... The pressure field corresponding to Fig. 7 is plotted in Fig. 8. We see that the pressure gradient is constant in each section and acts to ensure that the mass flow rates are equal in each region. Figure 9 shows the predicted velocity profiles in regions 1 and 2. The velocity in the first section is ...
... The pressure field corresponding to Fig. 7 is plotted in Fig. 8. We see that the pressure gradient is constant in each section and acts to ensure that the mass flow rates are equal in each region. Figure 9 shows the predicted velocity profiles in regions 1 and 2. The velocity in the first section is ...
Caius Iacob” Conference on
... 2. in the expression of the total electric current density the terms given by the densities of the induction (displacement) and respectively convection electric currents. Taking into consideration the flow vorticity effects, there always are some space curves (Selescu) along which the vector equatio ...
... 2. in the expression of the total electric current density the terms given by the densities of the induction (displacement) and respectively convection electric currents. Taking into consideration the flow vorticity effects, there always are some space curves (Selescu) along which the vector equatio ...
8.1 – Viscosity and the effects of temperature
... The distance between the particles will increase and the forces of attraction between the particles decreases as well after heating. 3) Draw a diagram to show what happens to the particles when a gas is heated. The particles in the gas will move faster when heated and collide more often causing m ...
... The distance between the particles will increase and the forces of attraction between the particles decreases as well after heating. 3) Draw a diagram to show what happens to the particles when a gas is heated. The particles in the gas will move faster when heated and collide more often causing m ...
Regular and Singular Points
... Consider the differential equation ẋ = f (x) and its associated dynamical system ϕ(t, x) on a phase space Ω. Definition We say that a point x ∈ Ω is an equilibrium point or a singular point or a critical point if f (x) = 0. For such a point, ϕ(t, x) = x for all t ∈ R. Definition A point x ∈ Ω that ...
... Consider the differential equation ẋ = f (x) and its associated dynamical system ϕ(t, x) on a phase space Ω. Definition We say that a point x ∈ Ω is an equilibrium point or a singular point or a critical point if f (x) = 0. For such a point, ϕ(t, x) = x for all t ∈ R. Definition A point x ∈ Ω that ...
PowerPoint Slides - University of Toronto Physics
... • Consider an ideal fluid, flowing through a tube which narrows. ...
... • Consider an ideal fluid, flowing through a tube which narrows. ...
Chapter 7.doc
... For laminar flow, Fig.7.2 gives the viscous boundary layer thickness and Fig. 7.3 gives the thermal boundary layer thickness t . ...
... For laminar flow, Fig.7.2 gives the viscous boundary layer thickness and Fig. 7.3 gives the thermal boundary layer thickness t . ...
Progress Review
... body of the Project work (CFD simulations & Data analysis). However, in order to complete a significant amount of work before the draft report is due in, the simulations will need to be completed as soon as possible. Completion of the first simulation is now overdue with the initial timetable target ...
... body of the Project work (CFD simulations & Data analysis). However, in order to complete a significant amount of work before the draft report is due in, the simulations will need to be completed as soon as possible. Completion of the first simulation is now overdue with the initial timetable target ...
(buoyancy-driven) stack ventilation
... recovery rather than relying on natural ventilation • this gives a consistent supply of fresh air, without a significant heating energy penalty • heat recovery in an MVHR system is typically achieved using a plate heat exchanger • this takes heat from the warm exhaust stream and transfers it to the ...
... recovery rather than relying on natural ventilation • this gives a consistent supply of fresh air, without a significant heating energy penalty • heat recovery in an MVHR system is typically achieved using a plate heat exchanger • this takes heat from the warm exhaust stream and transfers it to the ...
02_fluid properties
... Prob: A flat plate 0.1 m2 area is pulled at 30 cm/s relative to another plate located at a distance of 0.01 cm from it, the fluid separating them being water with dynamic viscosity of 0.001 Pa-s. Find the force and power required to maintain the velocity. Prob: Determine the torque and power requir ...
... Prob: A flat plate 0.1 m2 area is pulled at 30 cm/s relative to another plate located at a distance of 0.01 cm from it, the fluid separating them being water with dynamic viscosity of 0.001 Pa-s. Find the force and power required to maintain the velocity. Prob: Determine the torque and power requir ...
The non newtonian fluids
... Thixotropic-fluid (or thixotropic) : these are substances which, in contrast to the reopessic ones , tend to decrease their viscosity with the passing of time when subjected to shear forces. This variation of the viscosity depends on the speed and the intensity with which this force is applied, in f ...
... Thixotropic-fluid (or thixotropic) : these are substances which, in contrast to the reopessic ones , tend to decrease their viscosity with the passing of time when subjected to shear forces. This variation of the viscosity depends on the speed and the intensity with which this force is applied, in f ...
1 - vnhsphysics
... At the molecular level, air molecules randomly bounce off each other and prevent gaps. AIR MOLECULE DISTANCE Airplane wings are air foils designed to create greater distance for air molecules to travel above the wing than below the wing. AIR MOLECULE TIME Because air molecules quickly fill in availa ...
... At the molecular level, air molecules randomly bounce off each other and prevent gaps. AIR MOLECULE DISTANCE Airplane wings are air foils designed to create greater distance for air molecules to travel above the wing than below the wing. AIR MOLECULE TIME Because air molecules quickly fill in availa ...
School of Physics - The University of Sydney
... flow changes from laminar to turbulent will depend to some extent on the shape of the object. As a rough guide, however, we can also say in this case that the transition from laminar to turbulent flow occurs around a value of 2000. With increasing Reynolds number, before the flow becomes fully turbu ...
... flow changes from laminar to turbulent will depend to some extent on the shape of the object. As a rough guide, however, we can also say in this case that the transition from laminar to turbulent flow occurs around a value of 2000. With increasing Reynolds number, before the flow becomes fully turbu ...
637_diffusion
... • So far only physical processes responsible for the dispersion of a cloud or a plume due to only velocity fluctuations (instantaneous or continuous source in idealized stationary, homogeneous turbulence) • Because of the inherently random character of atmospheric motions, one can never predict with ...
... • So far only physical processes responsible for the dispersion of a cloud or a plume due to only velocity fluctuations (instantaneous or continuous source in idealized stationary, homogeneous turbulence) • Because of the inherently random character of atmospheric motions, one can never predict with ...
Electromagnetic Energy
... where it is converted into thermal energy. It is tempting to assume that the energy flows through the wires of the circuit, like water in a pipe. But if we look carefully we find that the energy density in the wires is much too small to account for the amount of energy in transit. In fact nearly all ...
... where it is converted into thermal energy. It is tempting to assume that the energy flows through the wires of the circuit, like water in a pipe. But if we look carefully we find that the energy density in the wires is much too small to account for the amount of energy in transit. In fact nearly all ...
Semiconductor Device Physics
... dx Drift current flows when an electric field is applied. Diffusion current flows when a gradient of carrier concentration exist. ...
... dx Drift current flows when an electric field is applied. Diffusion current flows when a gradient of carrier concentration exist. ...
Rooney AP Physics - Ch 9 Solids and Fluids
... • The internal friction is associated with the resistance between two adjacent layers of the fluid moving relative to each other ...
... • The internal friction is associated with the resistance between two adjacent layers of the fluid moving relative to each other ...
Electro-osmotically actuated oscillatory flow of a physiological fluid
... light weight and their sizes are small. However, owing to the small sizes of microvalves and micropumps, it is usually difficult to fabricate a mechanism to control the dynamics of fluid flow inside these devices. A promising approach to control the flow is the application of electrokinetic forces, ...
... light weight and their sizes are small. However, owing to the small sizes of microvalves and micropumps, it is usually difficult to fabricate a mechanism to control the dynamics of fluid flow inside these devices. A promising approach to control the flow is the application of electrokinetic forces, ...
CHAPTER 03
... True or False A. True B. False 17.If elevation effects are neglected, the stagnation pressure is ____. A. the largest pressure obtainable along a given streamline B. the smallest pressure obtainable along a given streamline C. always equal to zero 18.The total pressure is equal to the sum of the sta ...
... True or False A. True B. False 17.If elevation effects are neglected, the stagnation pressure is ____. A. the largest pressure obtainable along a given streamline B. the smallest pressure obtainable along a given streamline C. always equal to zero 18.The total pressure is equal to the sum of the sta ...
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.""