Bypass channel

Fig. 10.10 (a) Top and side views of a pair of full-bore blister rings (orifice plugs), and (b) schematic of the Todd barrel valve and barrel cross sections in the fully open and closed positions there is a bypass channel in the barrel immediately above the intersection of the blister rings and the barrel valve is rotatable in this bypass channel to vary the restriction of flow. [Reprinted by permission from D. B. Todd, The APV (Baker Perkins) Systems, in Plastics Compounding— Equipment and Processing, D. B. Todd, Ed., Hanser, Munich, 1998.]... 

Let s consider channeling (bypassing), as shown in Figure 13-16. similar to that showm in Figures 13-2 and 13-10(d). The space time for the reactor. system with bypassing (channeling) Tsa is... 

Two-component drug systems are on offer from a number of suppliers with dualchamber syringes for liquid-liquid and powder-liquid administration. The two compartments are separated by a floating rubber piston and the design of the glass body includes bypass channels to allow liquid transfer. 

In a further development, Schlund et al. have conceived a hydrodynamic gated injection scheme [52] similar to that developed for electro kinetic flows by Ramsey s group. In this method, an injection cross is formed by the intersection of the separation channel with a bypass channel, analogous to the analyte loading channel in 4-port CE and CFG chips. Continuous streams of sample and mobile phase are fed into the chip hydrodynamically, while at the cross the flows converge in such a way that the mobile phase stream is diverted into the separation channel, and the sample stream is forced into the bypass channel. At the confluence of the... 

A pressure head in the line drives an even smaller flow into the microchannel network. The sample flows through a bypass channel (not shown), and plugs are injected at will from this stream. A 10 1 flow reduction is realized in this manner, all the while obtaining a representative sample. 

However, when the petroleum reservoir lies at a shallow depth, increasing the pressure may lead to the formation of bypass channels that divert the oxidizer flow. 

Model Order Reduction (MOR), Fig. 1 Schematic representations of three dual networks for droplet traffic modeling (a) a loop, (b) a Y-junction with bypass channel, and (c) a ladder... 

Droplet Traffic in Microfluidic Networks Traffic of droplets (without splitting and merging) in a dual network can also be simulated in a similar method, which contains transport channels for droplet transport and bypass channels that cannot be accessed by droplets. Figure 1 shows three recently proposed devices for droplet traffic analysis a reversible encoding loop (Fig. la), a bypassed Y-junction for symmetric... 

Under linear conditions, when = 0, that is, when the resistance in the bypass channel is much greater than the combined resistance of the electrolyte in the cell manifold and the kinetic resistance associated with the anode and the cathode reactions, the bypass percentage index, J% is given as [51,52,56-58] ... 

The containment is provided with a system that prevents it from being damaged in the event of a primaiy drcuh loss-of-integrity accident. The system consists of a 70 m bubbler tank with 12 m gas volume and bypass channels with a safety valve communicating with different containment rooms. 

The polymer melt is forced from the metering section into a bypass flow channel by incorporating a multi-flighted screw section with reversed pitch and shallow channels between the metering section and the extraction section. The bypass channel has one or more adjustable restrictions to control the rate of flow into the extraction section. The polymer flows from the bypass channel into the beginning of the extraction section. Maddock and Matzuk concluded that bypass venting allows a wider range of operation, is less susceptible to instabilities, and is less operator-sensitive. 

This exercise is inspired by cooling problems in an industrial facility. Part of the flow of a river is diverted and fed into a bypass channel that goes through a grid with which it exchanges heat. The exercise deals with the hydraulics problem how is the flow rate distributed between the bypass channel and the river ... 

Test mold for transfer molding process (1) Upper clamping plate (2) transfer piston (3) external clamping (4) mold core (5) transfer cylinder (6) bypass channel (7) mold leader pin (8) upper mold half (9) hand grip (10) lower mold half (11) lower clamping plate... 

Until recently, the rheological measurements were confined to test labs for quality control, research, and development purposes. New techniques for on-line rheological measurements have been developed, bringing the analytical instrumentation to the production floor. This is accomplished by employing a closed-loop instrument which diverts a portion of the process stream to a measurement head and then returns it to the process. Within the measurement head, most of the material flows through a bypass channel and a fraction of the stream is pumped across a capillary die, using precision gear pumps. A similar concept, employed by another manufacturer, utilizes a slit die to measure viscosity. An open-loop on-line rheometer, which does not return the diverted melt stream to the process after measurement, splits the diverted melt stream to two capillary dies of different LID ratios... 

Constant total pressure drop across the channel BCs is typically imposed by use of a large bypass channel or by attaching large plena to the entrance and exit Parallel-channel tests are also conducted with large plena. Channels in which the pressure drop is imposed by pumping power injected into the fluid are usually not constant-pressure drop systems. For applications in the frequency domain the equation system is linearized about a uniform initial state. 

The temperature distribution in the loop is measured with chromel-alumel thermocouples and two Pt-100 temperature sensors for reference measurements. Absolute pressure is measured at the top of the riser and at the inlet of the core. The liquid level in the steam dome is measured with a differential pressure sensor. The differential pressure over the friction settings of the individual channels is a measure for the flow distribution over the coolant channels and bypass channels. The total flow in the loop is measured at 2 different positions with electromagnetic flow meters. The void fraction at a given height can be measured with gamma transmission techniques. At a fixed height at the top of the riser the radial void distribution is measured with a wire-mesh sensor, which measures the conduction of the two-phase mixture on a two-dimensional grid. Furthermore, laser doppler anemometry is used to study the local liquid velocity in the core or in the riser. 

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