Review of predictive models for the design of counterflow vortex tubes working with perfect gas

Lagrandeur, Junior; Poncet, Sébastien; Sorin, Mikhaı̈l

doi:10.1016/j.ijthermalsci.2019.03.024

Cited by 37 publications

(3 citation statements)

References 75 publications

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“…Lagrandeur et al 18 analyzed various processes in VT. They provide a productive review of predictive models that are used for designing counter‐flow VT and mention that it is possible to simplify the mathematical description of VT energy processes.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Combined Supersonic Separator and Vortex Tube Performance for Hydrocarbon Gas Drying

2021

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Experimental investigation of the combined supersonic separator (CSS) characteristics was carried out and the results were compared with those from the vortex tube. The separator is a counter‐flow vortex tube with an energy separation chamber in the shape of a Laval nozzle; it can be used for hydrocarbon gas transportation preparation and power plant fuel gas drying. Numerical modeling was carried out to confirm the flow specifics in the examined separator structure. Although the cooling capability of the CSS is 30–50 % less than that of the vortex tube, its efficiency of moisture removal is twice as large, as is shown by the experimental research. The maximal cooling power corresponds to a cold flow fraction level of 0.39, while the range of optimal values for the moisture separation is 0.4–0.6.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of the Combined Supersonic Separator and Vortex Tube Performance for Hydrocarbon Gas Drying

2021

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“…via the insertion of a rod along the cylinder axis [12,13], a small rotating disk at the stationary wall [14], the use of magnetohydrodynamics [15,16], the addition of a second fluid with a slightly different density [17], and the application of a temperature gradient in the axial direction [9,[18][19][20][21][22][23]. The latter case is of particular interest, as temperature gradients are a feature of many systems involving vortex breakdown, such as the effect of temperature non-uniformity in tornadoes [19], combustion in vortex burners [24,25], and separation of compressed gases in Ranque-Hilsch vortex tubes [26,27], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Effect of mixed convection on laminar vortex breakdown in a cylindrical enclosure with a rotating bottom plate

Quaresma

Cruz

Cagney

et al. 2020

International Journal of Thermal Sciences

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Vortex breakdown plays a central role in the performance of countless rotating machinery applications, many of which contain thermal gradients either inadvertently or by design. The effect of thermal gradients on vortex breakdown and further flow development in a cylindrical domain with a rotating bottom plate is examined using the Generalized Integral Transformation Technique (GITT) with a streamfunction-only formulation. A thermal gradient is imposed in the axial direction, such that the buoyancy forces oppose the base flow driven by the rotation of the lower plate, i.e. the temperature difference acts to stabilize the flow. The hybrid numerical-analytical approach is shown to accurately capture vortex breakdown phenomena for a variety of conditions involving single, double and triple recirculation bubbles. The buoyancy forces -expressed in terms of the Richardson number (Ri) -act to suppress vortex breakdown in all cases examined and led to a series of flow transitions with increasing Ri, characterized by the appearance of a stratified structure with multiple fluid layers. These flow transitions have a significant impact on the overall performance of the system. The torque coefficient decreases with Ri, compared to the base (isothermal) case following an empirical power law relationship, which is independent of Reynolds number, aspect ratio or number of fluid layers present. Flow stratification suppresses the transport of angular momentum; azimuthal velocity is shown to decline exponentially in the regions where layering occurs, accompanied by a sharp reduction in the Nusselt number, as fluid layers act to insulate the upper plate.

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“…Many studies in the literature are concerned with specific improvement of reverse cycle machines, most recently dealing with topical applications, namely, thermoelectric cooler [ 11 ], vortex tube design models [ 12 ], electronic cooling with nanofluids [ 13 ], ground source heat pumps applications [ 14 ], electrocaloric refrigeration [ 15 ], or magnetic refrigeration [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Machine Entropy Production on the Optimal Performance of a Refrigerator

Feidt

Costea

2020

Entropy

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The need for cooling is more and more important in current applications, as environmental constraints become more and more restrictive. Therefore, the optimization of reverse cycle machines is currently required. This optimization could be split in two parts, namely, (1) the design optimization, leading to an optimal dimensioning to fulfill the specific demand (static or nominal steady state optimization); and (2) the dynamic optimization, where the demand fluctuates, and the system must be continuously adapted. Thus, the variability of the system load (with or without storage) implies its careful control-command. The topic of this paper is concerned with part (1) and proposes a novel and more complete modeling of an irreversible Carnot refrigerator that involves the coupling between sink (source) and machine through a heat transfer constraint. Moreover, it induces the choice of a reference heat transfer entropy, which is the heat transfer entropy at the source of a Carnot irreversible refrigerator. The thermodynamic optimization of the refrigerator provides new results regarding the optimal allocation of heat transfer conductances and minimum energy consumption with associated coefficient of performance (COP) when various forms of entropy production owing to internal irreversibility are considered. The reported results and their consequences represent a new fundamental step forward regarding the performance upper bound of Carnot irreversible refrigerator.

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Review of predictive models for the design of counterflow vortex tubes working with perfect gas

Cited by 37 publications

References 75 publications

Comparative Study of the Combined Supersonic Separator and Vortex Tube Performance for Hydrocarbon Gas Drying

Comparative Study of the Combined Supersonic Separator and Vortex Tube Performance for Hydrocarbon Gas Drying

Effect of mixed convection on laminar vortex breakdown in a cylindrical enclosure with a rotating bottom plate

Effect of Machine Entropy Production on the Optimal Performance of a Refrigerator

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