Analytical model for estimating thermophysical and strength parameters of the cooled pipe with the twisted tape under asymmetric heating by a pulse of external heat flux

Naumov, V. K.; Semashko, N. N.

doi:10.1080/10519999408225557

Cited by 6 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…The passive techniques are advantageous compared with the active techniques because the swirl inserts manufacturing process is simple and can be easily employed in an existing heat exchanger. Moreover the passive techniques can play an important role in the heat transfer augmentation if a proper configuration of the insert is being selected depending on working conditions that have been reported in the literature [1][2][3][4][5][6][7][8][9]. Due to advances in computer software, the Computational Fluid Dynamics (CFD) modelling technique was developed as a powerful and effective tool for more understanding the hydrodynamics of heat transfer when using twist tape inserts.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of Heat Transfer and Friction Factor Augmentation in a Circular Tube Fitted with Elliptic-Cut Twisted Tape Inserts

Salman

Kadhum²,

Takriff³

et al. 2013

Mathematical Problems in Engineering

View full text Add to dashboard Cite

This paper presents the application of a mathematical model for simulation of the swirling flow in a tube induced by elliptic-cut and classical twist tape inserts. Effects of the twist ratio (y=2.93, 3.91, and 4.89) and cut depth (w=0.4, 0.8, and 1.4 cm) on heat transfer enhancement (Nu) and friction factor (f) in laminar flow are numerically investigated. The simulation is carried out using commercial CFD package (FLUENT-6.3.26) to grasp the physical behaviour of the thermal and fluid flows of a constant heat-fluxed tube fitted with elliptic-cut twist tape in the laminar flow regime for the Reynolds number ranging from 200 to 2100. The simulated results matched the literature correlations of plain tube for validation with 8% variation for Nusselt number and 10% for friction factor. The results show that the heat transfer rate and friction factor in the tube equipped with elliptic-cut twist tape (ECT) are significantly higher than those fitted with classical twist tape (CTT). Moreover the results also reveal that the Nusselt number and the friction factor in the tube with elliptic-cut twisted tape (ECT) increase with decreasing twist ratios (y) and cut depths (w).

show abstract