Finite-difference approximation of the adiabatic cross-section technique in a numerical analysis of the single-side heating process of a cooled pipe with the twisted tapeinside by an external heat flux pulse

Naumov, V. K.; Semashko, N. N.; Komov, A. T.

doi:10.1080/10519999508225569

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…Naumov et al [65,66] used a mathematical model for an adiabatic cross-section to study the pulsed asymmetric heating of pipes by an external heat flux and calculated the thermophysical parameters of cooled pipes containing twisted tapes within the collector of deviated ions in the T-15 tokamak injection system. Yokoya et al [68] demonstrated a novel use of twisted tapes in controlling the flow in a continuous casting mould and refining process.…”

Section: Twisted Tape In Turbulent Flowmentioning

confidence: 99%

Review of passive heat transfer augmentation techniques

Dewan

Mahanta

Raju

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part A:

322

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Heat transfer augmentation techniques (passive, active or a combination of passive and active methods) are commonly used in areas such as process industries, heating and cooling in evaporators, thermal power plants, air-conditioning equipment, refrigerators, radiators for space vehicles, automobiles, etc. Passive techniques, where inserts are used in the flow passage to augment the heat transfer rate, are advantageous compared with active techniques, because the insert manufacturing process is simple and these techniques can be easily employed in an existing heat exchanger. In design of compact heat exchangers, passive techniques of heat transfer augmentation can play an important role if a proper passive insert configuration can be selected according to the heat exchanger working condition (both flow and heat transfer conditions). In the past decade, several studies on the passive techniques of heat transfer augmentation have been reported. The present paper is a review on progress with the passive augmentation techniques in the recent past and will be useful to designers implementing passive augmentation techniques in heat exchange. Twisted tapes, wire coils, ribs, fins, dimples, etc., are the most commonly used passive heat transfer augmentation tools. In the present paper, emphasis is given to works dealing with twisted tapes and wire coils because, according to recent studies, these are known to be economic heat transfer augmentation tools. The former insert is found to be suitable in a laminar flow regime and the latter is suitable for turbulent flow. The thermohydraulic behaviour of an insert mainly depends on the flow conditions (laminar or turbulent) apart from the insert configurations. The present review is organized in five different sections: twisted tape in laminar flow; twisted tape in turbulent flow; wire coil in laminar flow; wire coil in turbulent flow; other inserts such as ribs, fins, dimples, etc.

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Section: Twisted Tape In Turbulent Flowmentioning

confidence: 99%

Review of passive heat transfer augmentation techniques

Dewan

Mahanta

Raju

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part A:

322

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“…-accepted ion beam power density distribution along the pipe length, input parameters of a water flow cooling the pipe and thermophysical properties of the same as those in [3]. The temperature field calculatidns were performed by a finite difference technique for the model of adiabatic cross-sections presented in [3].…”

Section: Non-stationary Thermoelastic Stresses 22mentioning

confidence: 99%

“…The temperature field calculatidns were performed by a finite difference technique for the model of adiabatic cross-sections presented in [3].…”

Section: Non-stationary Thermoelastic Stresses 22mentioning

confidence: 99%

“…, N is determined for the temperature field approximation by an expansion of the type (l), for which there are precise analytical expressions for the tensor components of thermoelastic stresses in a circular ring for the models (ezZ = 0) of plane deformations and stresses (OZZ = 0) [l]. The described procedure of estimating thermoelastic stresses is used, e.g., in [3], in calculations of non-stationary thermoelastic stresses at the borders of the heilt-accepting ion dump pipe cross-sections in the T-15 tokamak injection system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Non-stationary thermoelastic stresses in heat-removing elements of the beam dumps in the T-15 tokamak injection system

Naumov¹,

Semashko²,

Barashkovand³

et al. 1997

Plasma Devices and Operations

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The closed analytical solution to the problem of determining quasi-static thermoelastic stresses in circular cross-sections of heat-removing cooled elements of the beam dumps in T-15-tokamak injection system is given.The generalized analytical representation of a tangential component in the tensor of thermoelastic stresses at the borders of the pipe cross-section is given. It is realized by the nonstationary field temperature distribution in the structural material, produced from the conesponding boundary conditions of heating.The results of comparison between the distributions of a tangential component in the thermoelastic stress at the borders of the most heat-stressed cross-section of a heat-removing pipes of the beam dump in T-15 injector (calculated by the suggested relationships) in the process of heating for 1.5 s. by the ion beam pulse are considered. They are accompanied by the corresponding calculations of the mentioned stresses on the basis of the generally-accepted approximation [I 1 produced from the solution to the stationary heat conduction problem.

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