Viscous normal stress on a slip surface
... Enhanced mixing plays an important role in biological and chemical analysis in microfluidic systems. The Reynolds number, which measures the importance of the inertia force relative to the viscous force, is very small for flows in a microfluidic device due to the small dimensions of the device. Conv ...
... Enhanced mixing plays an important role in biological and chemical analysis in microfluidic systems. The Reynolds number, which measures the importance of the inertia force relative to the viscous force, is very small for flows in a microfluidic device due to the small dimensions of the device. Conv ...
ent 153_bernoulli equation
... Streamlines, Pathlines and Streaklines A streamline in a fluid flow is a line tangent to which at any point is in the direction of velocity at that point at that instant. • Streamlines are, therefore, equivalent to an instantaneous snap-shot indicating the directions of velocity in the entire flow ...
... Streamlines, Pathlines and Streaklines A streamline in a fluid flow is a line tangent to which at any point is in the direction of velocity at that point at that instant. • Streamlines are, therefore, equivalent to an instantaneous snap-shot indicating the directions of velocity in the entire flow ...
The Physics of Flow
... much less dense than nitrogen (which makes up 79% of air), therefore making heliox much less dense than air. In patients with upper airway obstruction, flow is through an orifice and hence more likely to be turbulent and dependent on the density of the gas passing through it. Therefore for a given p ...
... much less dense than nitrogen (which makes up 79% of air), therefore making heliox much less dense than air. In patients with upper airway obstruction, flow is through an orifice and hence more likely to be turbulent and dependent on the density of the gas passing through it. Therefore for a given p ...
momentum principle
... Reynolds Transport Theorem with B = mv becomes Notice the little “v ” and the big “V ” in the last term. The big “V ” comes from the Reynolds Transport Theorem. It is the fluid velocity relative to the control surface. ...
... Reynolds Transport Theorem with B = mv becomes Notice the little “v ” and the big “V ” in the last term. The big “V ” comes from the Reynolds Transport Theorem. It is the fluid velocity relative to the control surface. ...
Solution - Icivil-Hu
... 2) draw the coordinate system 3) identify where mass enters/leaves the control volume 4) identify the forces acting on the control volume For forces there two kinds: 1) is called body forces like gravity which acts at every element of the body; 2) surface forces, which require a contact with the con ...
... 2) draw the coordinate system 3) identify where mass enters/leaves the control volume 4) identify the forces acting on the control volume For forces there two kinds: 1) is called body forces like gravity which acts at every element of the body; 2) surface forces, which require a contact with the con ...
Physical Principles - Thayer School of Engineering
... Perhaps the most direct and tangible way to state the physical principles that govern the motion of fluids is to formulate them in terms of budgets for finite portions of the fluid. For such enterprise, we first need to decide on two things: For what do we do a budget? And, where do we perform this ...
... Perhaps the most direct and tangible way to state the physical principles that govern the motion of fluids is to formulate them in terms of budgets for finite portions of the fluid. For such enterprise, we first need to decide on two things: For what do we do a budget? And, where do we perform this ...
Slide 1 - Union College
... Many new devices and applications are being created that involve transporting droplets from one place to another. A common method of achieving this is through electrocapillary effects, a process through which a surface is electrowetted in such a way that it will cause a droplet to be pulled forward. ...
... Many new devices and applications are being created that involve transporting droplets from one place to another. A common method of achieving this is through electrocapillary effects, a process through which a surface is electrowetted in such a way that it will cause a droplet to be pulled forward. ...
Understanding Choked Flow in Fisher™ Valves
... presence of cavitation or flashing, it does not necessarily mean damage will occur. There are many different characteristics of the operating conditions and valve construction that must be considered when trying to determine if damage will occur due to the cavitation present in any given application ...
... presence of cavitation or flashing, it does not necessarily mean damage will occur. There are many different characteristics of the operating conditions and valve construction that must be considered when trying to determine if damage will occur due to the cavitation present in any given application ...
Chapter 3 Basic of Fluid Flow
... particles to vary from point to point throughout the flow field. The motion of fluids can be predicted using the fundamental laws of physics together with the physical properties of the fluid. The geometry of the motion of fluid particles in space and time is known as the kinematics of the fluid ...
... particles to vary from point to point throughout the flow field. The motion of fluids can be predicted using the fundamental laws of physics together with the physical properties of the fluid. The geometry of the motion of fluid particles in space and time is known as the kinematics of the fluid ...
Hydraulic jumps in rectangular channels
Hydraulic jump in a rectangular channel, also known as classical jump, is a natural phenomenon that occurs whenever flow changes from supercritical to subcritical flow. In this transition, the water surface rises abruptly, surface rollers are formed, intense mixing occurs, air is entrained, and often a large amount of energy is dissipated. In other words, a hydraulic jump happens when a higher velocity, v1, supercritical flow upstream is met by a subcritical downstream flow with a decreased velocity, v2, and sufficient depth. Numeric models created using the Standard Step Method or HEC-RAS are used to track supercritical and subcritical flows to determine where in a specific reach a hydraulic jump will form. There are common hydraulic jumps that occur in everyday situations such as during the use of a household sink. There are also man-made hydraulic jumps created by devices like weirs or sluice gates. In general, a hydraulic jump may be used to dissipate energy, to mix chemicals, or to act as an aeration device.To produce equations describing the jump, since there is an unknown energy loss, there is a need to apply conservation of momentum. To develop this equation, a general situation in which there may or may not be an energy loss between upstream and downstream, and there may or may not be some obstacle on which there is a drag force Pf is considered. however, for a simple or classic hydraulic jump the force per unit width(Pf) equals 0. From there the momentum equation, and the conjugate depths equation can be derived.