Numerical Simulation of Helically Coiled Closed Loop Pulsating Heat Pipe

Adhikari, Bhagwat; Maharjan, Sanjeev

doi:10.31033/ijemr.9.2.26

Cited by 1 publication

(3 citation statements)

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“…One of the first experimentally developed correlations, if not the first, for turbulent convective flows in helical coils was reported in 1925 by Jeschke [114]. This correlation has the form Nu = (0.039 + 0138γ)(RePr) 0.76 (48) and is valid for Re < 1.5 × 10 5 , 0.050 < γ < 0.15 and Pr of air. The exponent of the Prandtl number in most modern correlations for turbulent convection in helical tubes is 0.4, which is also appropriate for straight pipes.…”

Section: Heat Transfermentioning

confidence: 93%

“…The wider range of applications of such management systems imposes a strong demand that is attracting many scientists and engineers. In this line, the recent work by Adhikari and Maharjan [48] represents one such effort towards the improvement in design and capabilities of heat pipes. In particular, they performed CFD simulations of helically coiled closed-loop pulsating heat pipes on the basis of the experiments conducted by Pachghare and Mahalle [153].…”

Section: Flow and Heat Transfer In Corrugated And Twisted Helical Pipesmentioning

confidence: 99%

“…In comparison to experimental research, numerical papers on helically coiled flow appear to be much more numerous. Most of this work has been oriented to study the prediction of laminar flow and heat transfer [40][41][42][43][44], turbulent flow [17,45,46], entropy generation [47], pulsating flow [48] and flow characteristics [49][50][51]. Investigations on multiphase flow in helical pipes are by far much more scarce (see, for instance, Colombo et al [52] and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Fluid Flow in Helically Coiled Pipes

Sigalotti,

Alvarado-Rodríguez,

Rendón

2023

Fluids

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Helically coiled pipes are widely used in many industrial and engineering applications because of their compactness, larger heat transfer area per unit volume and higher efficiency in heat and mass transfer compared to other pipe geometries. They are commonly encountered in heat exchangers, steam generators in power plants and chemical reactors. The most notable feature of flow in helical pipes is the secondary flow (i.e., the cross-sectional circulatory motion) caused by centrifugal forces due to the curvature. Other important features are the stabilization effects of turbulent flow and the higher Reynolds number at which the transition from a laminar to a turbulent state occurs compared to straight pipes. A survey of the open literature on helical pipe flows shows that a good deal of experimental and theoretical work has been conducted to derive appropriate correlations to predict frictional pressure losses under laminar and turbulent conditions as well as to study the dependence of the flow characteristics and heat transfer capabilities on the Reynolds number, the Nusselt number and the geometrical parameters of the helical pipe. Despite the progress made so far in understanding the flow and heat transfer characteristics of helical pipe flow, there is still much work to be completed to address the more complex problem of multiphase flows and the impact of pipe deformation and corrugation on single- and multiphase flow. The aim of this paper is to provide a review on the state-of-the-art experimental and theoretical research concerning the flow in helically coiled pipes.

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Section: Heat Transfermentioning

confidence: 93%

Section: Flow and Heat Transfer In Corrugated And Twisted Helical Pipesmentioning

confidence: 99%