Numerical Simulation of Effect of Shell Heat Transfer on the Vortex Tube Performance

Pourmahmoud, Nader; Abbaszadeh, Mohammad; Rashidzadeh, Masoud

doi:10.18280/ijht.340220

Cited by 6 publications

(6 citation statements)

References 20 publications

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“…Access to an appreciable group of available experimental data is taken as a starting point for the present study. The correlation of the available experimental quantities allows having a unique function for the evaluation of condensation heat transfer coefficient, which responds to the following expression [25][26][27][28][29] (19) The experimental data used in the generalization and development of the expression (16) and (17) are provided in table 4. Figure 2 shows the correlation of experimental data.…”

Section: Experimental Validation Of a Single Model For Condensation Imentioning

confidence: 99%

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Camaraza-Medina¹,

Khandy²,

Carlson³

et al. 2018

MMEP

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In this paper, a modification to the dominant flow criteria is presented for the study of heat transfer by confined condensation in Air Cooled Condenser (ACC) systems. The new methodology combines in one single procedure the analysis, which with the current methods requires tedious grouping processes. A new proposal reduces the average error by computing 22% in 88.7% of the available samples and includes the shear stress produced by the steam drag when it flows at speeds greater than 40 m/s. New method is also valid for a vapor quality located between 0.9 and steam flows between 3 and 590 kg/(m2/s-1), values for the Reynolds number for the liquid portion between 660 and 58 540 and the Reynolds number for the vapor portion located between 1 320 and 333 120, internal equivalent diameters of the tubes comprised between 7.4 to 49 mm.

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Section: Experimental Validation Of a Single Model For Condensation Imentioning

confidence: 99%

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Camaraza-Medina¹,

Khandy²,

Carlson³

et al. 2018

MMEP

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“…Where: 𝑄 𝑐 ̇= thermal power (Watt), 𝑚̇𝑐= cold mass fraction (Kg/s), 𝑇 𝑖𝑛 = temperature inlet, 𝑇 𝑐 = cold temperature, 𝐶 𝑝 = specific heat of air (J/Kg.C) [26]. 𝑅𝐸 = 𝑚. 𝐶 𝑝 .…”

Section: Methodsmentioning

confidence: 99%

Optimization of Vortex Tube Design and Performance for Cooling Milling Process

Sifa,

Endramawan,

Safi'i

et al. 2023

IJIE

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The manufacturing process is required to improve cleanliness and reduce environmental pollution and the exploration of natural resources is limited. One of the manufacturing processes is machining, especially the milling process. The phenomenon during the milling process friction occurs when the workpiece is cut by the milling tool, the effect friction between tool and workpiece occurs temperature rise. To reduce the temperature rise of the milling tool during the workpiece cutting process, an effective and efficient alternative cooling is needed through the use of vortex tubes. The research method was carried out using the Computational Fluid Dynamic (CFD) approach and experiments with the use of inlet pressure = 1-5 Bar, and the parameters of variations in valve shape, number of nozzles, and pipe lengths. The overall results of the CFD and experiment of parameters in inlet pressure on the number of nozzles, valve shapes, and tube lengths, have an impact on the increasing inlet pressure, the higher the thermodynamic characteristics that occur in the vortex tube, but there is a loss of outlet pressure in each parameter. The geometry of the vortex tube selected is the number of nozzles 6, valve fillet shape, and tube length of 50 mm, vortex tube can be used for cooling the milling tool with the addition of a flexible hose at a distance of 5 cm from the tooltip.

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“…Many investigations have been carried out in order to clarify this problem. In figure 4 are given the average values of experimental results reported by [17][18]. This figure provides the variation of the local Nusselt number depending on the angle , on the periphery of a finned cylinder bathed by a cross and perpendicular airflow.…”

Section: Fluid Crossing Of a Finned Tubes Bank And His Influence On Lmentioning

confidence: 99%

Simplified analysis of heat transfer through a finned tube bundle in air cooled condenser-second assessment

Camaraza-Medina¹,

Rubio-Gonzale²,

Cruz-Fonticiella³

et al. 2018

MMEP

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This paper present a review of mathematical procedures for heat transfer studies in cross flow through finned tube pack. Is given a new model for heat transfer calculations during airflow through finned tubes bank in air cooled condenser systems (ACC). The model was correlated with a total of 783 sets of available experimental data provided by ten authors of recognized prestige in the research area. The air flow bathes a package of finned tubes with an inclination of 45 0 to 60 0 with respect to the horizontal line. The studies were performed for ST/SL intervals between 0.4 and 2, air flow velocity of 0.1 to 100 m/s, an ambient temperature of 15 to 43°C, the incident wind velocity over the installation between 0 and 45 km/h, the outer equivalent diameter of the bare tubes between 0.019 and 0.05 m, a fins height between 2.7 and 7.9 mm.The fins thicknesses ranging between 1.3 and 3.5 mm and a number of fins per unit tube length between 315 and 394. The mean deviation found was 6.9% in 85.3% of the correlated experimental data.

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Numerical Simulation of Effect of Shell Heat Transfer on the Vortex Tube Performance

Cited by 6 publications

References 20 publications

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Evaluation of condensation heat transfer in air-cooled condenser by dominant flow criteria

Optimization of Vortex Tube Design and Performance for Cooling Milling Process

Simplified analysis of heat transfer through a finned tube bundle in air cooled condenser-second assessment

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