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Capillary Tube

This case study demonstrates the modeling of a capillary tube. Capillary tubes are used as expansion devices on some vapor-compression refrigeration systems. The refrigerant used in this case study is R22.

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Gas turbine combustor design

Application of the network approach to the modeling of three combustor types, i.e. two annular- and a reverse flow combustor, is discussed in this case study. The network method effectively deals with complicated and unusual geometries, is not prone to numerical difficulties, and has the advantage of rapid execution. It removes many limitations placed by conventional semi-empirical modeling techniques. It may be applied to model all conceivable combustor types. It is shown that simulation results obtained with the network approach closely match those obtained experimentally, as well as by a thoroughly validated industrial one-dimensional combustor code “CODAS”. 

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Finned Tube Heat Exchanger - Transient

This case study demonstrates the transient thermal fluid simulation of a finned tube heat exchanger. The finned tube heat exchanger model can also be used in cycle analysis where it is used in conjunction with other models (See “Start-up of two-shaft High-Temperature Gas-Cooled Nuclear Power plant” case study).

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Insulation Flow Balancing

This case study investigates the balancing of forced flow through a perforated flow distribution manifold situated between the thermal insulation and the bottom of a cylindrical test cavity that forms part of a highly specialized experimental facility. The purpose of the insulation and manifold is to adequately insulate the very high temperatures within the test section while still allowing forced flow of gas to enter at the bottom of the test cavity.

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Natural Convection through a U-tube

This case study demonstrates the capability of Flownex to simulate natural convection (buoyancy driven flow). This is done by demonstrating the simulation of natural convection of air through a U-tube due to heat addition to one of the U-tube walls.

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Shell & Tube Heat Exchanger - Transient

This case study demonstrates the steady-state thermal fluid simulation of a shell and tube heat exchanger. The shell and tube heat exchanger model can also be used in cycle analysis where it is used in conjunction with other models (See “Start-up of two-shaft High-Temperature Gas-Cooled Nuclear Power plant” case study). 

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Sphere Pneumatic Transport

Being able to introduce user coding to the transient simulation, the sphere kinematics (interaction between a sphere and gas flow) can be incorporated in the simulation to predict the exact overall system behavior. The maximum pebble velocity being conveyed (a critical design restriction) can be predicted and designed for.

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Water Hammer Analysis

This case study demonstrates the capability of Flownex to simulate the water hammer effect by simulating the sudden closure of a valve at the outlet of a long pipe in which water is flowing. In practice, this closure could be facilitated by a fast acting valve or similar device. The model takes the fluid and pipe wall elasticity into account.

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Water Jacket Flow Balancing

This case study demonstrates the flow balancing that was investigated as part of the design of a water jacket. The water jacket is used to cool a cylindrical test section that forms part of a highly specialized experimental facility.

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