Performance Assessment of Parallel Connected Ranque–Hilsch Vortex Tubes Using Nitrogen, Oxygen, and Air With Brass and Polyamide Nozzles: An Experimental Analysis

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Volkan Kirmaci
Keyword(s):  
Vortex Tube ◽  
Experimental Studies ◽  
Working Fluid ◽  
Tube System ◽  
Working Fluids ◽  
Heating And Cooling ◽  
Thermodynamic Performance ◽  
Outlet Valve ◽  
And Performance ◽  
Vortex Tubes

Abstract In this study, heating and cooling performances of two vortex tubes connected in parallel using different working fluids were compared. In experimental studies, oxygen, nitrogen, and air were used as working fluids in counterflow Ranque–Hilsch vortex tube (RHVT) and performance evaluation was performed. Nozzles made of polyamide and brass are used, and the number of these nozzles is 2, 4, and 6. Compressed working fluids were used to operate the vortex tube system at different inlet pressure values varying from 150 kPa to 600 kPa with 50 kPa increment. The geometric characteristics of the vortex tube are the length of the hot tube and the diameter of the orifice, which are 100 mm and 7 mm, respectively. Experiments were performed with the hot flow outlet valve fully open. The thermodynamic performance of the parallel connected vortex tube system was determined by performing exergy analysis. As a result of experimental studies, the highest performance of parallel connected RHVT system was obtained when nitrogen was used as a working fluid with brass-six-nozzle at 600 kPa.

Experimental Study About Performance Analysis of Parallel Connected Ranque–Hilsch Counter Flow Vortex Tubes With Different Nozzle Numbers and Materials

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Hüseyin Kaya ◽  
Fahrettin Günver ◽  
Onuralp Uluer ◽  
Volkan Kırmacı
Keyword(s):  
Exergy Analysis ◽  
Vortex Tube ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Inlet Pressure ◽  
Working Fluid ◽  
Counter Flow ◽  
Heating And Cooling ◽  
Flow Vortex ◽  
Vortex Tubes

An experimental analysis for parallel connected two identical counter flow Ranque–Hilsch vortex tubes (RHVT) with different nozzle materials and numbers was conducted by using compressed air as a working fluid in this paper. Heating and cooling performance of vortex tube system (circuit) and the results of exergy analysis are researched comprehensively according to different inlet pressure, nozzle numbers, and materials. Nozzles made of polyamide plastic, aluminum, and brass were mounted into the vortex tubes individually for each case of experimental investigation with the numbers of nozzles 2, 3, 4, 5, and 6. The range of operated inlet pressure 150–550 kPa with 50 kPa variation. The ratio of length–diameter (L/D) of each vortex tube in the circuit is 14 and the cold mass fraction is 0.36. Coefficient of performance (COP) values, heating, and cooling capacity of the parallel connected RHVT system were evaluated. Further, an exergy analysis was carried out to evaluate the energy losses and second law efficiency of the vortex tube circuit. The greatest thermal performance was obtained with aluminum-six-nozzle when taking into account all parameters such as temperature difference, COP values, heating and cooling capacity, and exergy analysis.

Performance Analysis and Comparison Study of Transcritical Power Cycles Using CO2-Based Mixtures as Working Fluids

2016 ◽  
Author(s):  
Jiaxi Xia ◽  
Jiangfeng Wang ◽  
Pan Zhao ◽  
Dai Yiping
Keyword(s):  
Critical Temperature ◽  
Parametric Optimization ◽  
Design Parameters ◽  
Working Fluid ◽  
Comparison Study ◽  
Software Environment ◽  
Working Fluids ◽  
Power Cycles ◽  
Power Cycle ◽  
Thermodynamic Performance

CO2 in a transcritical CO2 cycle can not easily be condensed due to its low critical temperature (304.15K). In order to increase the critical temperature of working fluid, an effective method is to blend CO2 with other refrigerants to achieve a higher critical temperature. In this study, a transcritical power cycle using CO2-based mixtures which blend CO2 with other refrigerants as working fluids is investigated under heat source. Mathematical models are established to simulate the transcritical power cycle using different CO2-based mixtures under MATLAB® software environment. A parametric analysis is conducted under steady-state conditions for different CO2-based mixtures. In addition, a parametric optimization is carried out to obtain the optimal design parameters, and the comparisons of the transcritical power cycle using different CO2-based mixtures and pure CO2 are conducted. The results show that a raise in critical temperature can be achieved by using CO2-based mixtures, and CO2-based mixtures with R32 and R22 can also obtain better thermodynamic performance than pure CO2 in transcritical power cycle. What’s more, the condenser area needed by CO2-based mixture is smaller than pure CO2.

scholarly journals Распределение температуры на оси камеры расширения при различных схемах работы вихревой трубы

2021 ◽  
Vol 47 (19) ◽  
pp. 41
Author(s):  
В.Н. Самохвалов
Keyword(s):  
Air Temperature ◽  
Vortex Tube ◽  
Axial Zone ◽  
Expansion Chamber ◽  
Counter Flow ◽  
Heating And Cooling ◽  
Flow Vortex ◽  
Single Flow ◽  
Vortex Tubes ◽  
Nozzle Inlet

The change in air temperature along the axis of the expansion chamber in the zones of the nozzle inlet and the flow swirler in the direct-flow, counter-flow, three-flow and single-flow vortex tubes has been investigated. It has been established that in all cases, the cooling of air in the vortex tube occurs in the zone of the swirling device, and its heating - in the zone of unwinding of the flow. The change in air temperature in the axial zone along the length of the expansion chamber occurs due to heat exchange between the heating and cooling zones.

Shock Wave and Pulsation Aspects of Rank-Hilsch Effect in Vortex Tubes used in Gases Stratification

2020 ◽  
Vol 8 (1) ◽  
pp. 51-78
Author(s):  
Vladimir Devisilov ◽  
D. Zhidkov
Keyword(s):  
Shock Wave ◽  
Vortex Tube ◽  
Experimental Studies ◽  
Thermodynamic Characteristics ◽  
Present Moment ◽  
Hydrocarbon Gases ◽  
Associated Gas ◽  
Vortex Effect ◽  
Flow Vortex ◽  
Vortex Tubes

Vortex tubes based on Rank-Hilsch effect are widely used in gas separation technologies, cleaning of harmful gas emissions in the atmosphere protection, capture of oil-associated gas, cooling systems in chemical, petrochemical and other industries. However, up to the present moment in their design the calculation methods produce significant errors and require experimental improvement. Until now, existing theories of vortex effect don’t provide an adequate response to phenomena observed in experiments. In this paper have been presented examples of enthalpy balance disorders during operation of three-flow vortex tubes on hydrocarbon gases, as well as two-flow vortex tubes on air, based on analytical and critical analysis of a large number of various authors’ studies. Has been proposed shock wave and pulsation hypothesis for description of vortex effect and its main demonstrations. It has been shown that the proposed hypothesis can complement existing theories of vortex effect, and its accounting allows explain these processes. Have been presented thermodynamic characteristics of a bench double-flow vortex tube in laboratory experiment. Have been performed measurements of amplitude-frequency characteristics of vibrations performing external (mechanical) work under effect of gas-dynamic pulsations in vortex tubes. It has been demonstrated that vibration leads to gas kinetic energy dissipation into environment, resulting in enthalpy imbalance on the vortex tube. Has been performed analysis of additional cooling capacity, as well as heating of the vortex pipe mixed flow compared to throttling effect. The mechanism of shock wave and pulsation processes has been explained qualitatively based on analysis of a large number of various authors’ works and own experimental studies. It is emphasizing that the proposed qualitative mechanism requires further development and mathematical description based on the developed physical model.

Investigation of Performance of Heating and Cooling of Counter Flow Ranque-Hilsch Tubes with L/D=15, 16, 17, 18 for Brass

2013 ◽  
Vol 372 ◽  
pp. 350-353 ◽  
Author(s):  
Kevser Dincer ◽  
Adnan Berber ◽  
Dilek Nur Ozen
Keyword(s):  
Vortex Tube ◽  
Experimental Results ◽  
Counter Flow ◽  
Working Pressure ◽  
Cooling Performance ◽  
Cold Flow ◽  
Heating Performance ◽  
Heating And Cooling ◽  
Maximum Heating ◽  
Vortex Tubes

In this study, heating and cooling performances of counter flow Ranque-Hilsch vortex tubes (RHVTs) were experimentally investigated for brass. The vortex tubes were made of brass. Diameter of vortex tube (D) was 10 mm. Length of vortex tube (L) was 15D, 16D, 17D and18D. The number of nozzles (Nn) was 5. The conical edges of the plugs have a slope of 30o angle. Working pressure of Ranque-Hilsch was 460 kPa (absolute). According to the experimental results, the maximum heating performance of the RHVT system was found to be 39,5 °C at P17 and the maximum cooling performance of the RHVT in this study was found to be-28,6 °C at P18. An increase in fraction of cold flow (ξ) led to a increase in the heating performance.

scholarly journals PERFORMANCE ANALYSIS OF WORKING FLUIDS ON ORGANIC RANKIE CYCLE (ORC) MODEL WITH BIOMASS ENERGY AS A HEAT SOURCES

2019 ◽  
Vol 8 (3) ◽  
pp. 175
Author(s):  
Lilis Sucahyo
Keyword(s):  
Performance Analysis ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Biomass Energy ◽  
Working Fluid ◽  
Inlet Temperature ◽  
Heat Sources ◽  
Working Fluids ◽  
Fluid Properties ◽  
And Performance

Organic Rankine Cycle (ORC) is an electricity power technology particularly suitable for medium-low temperature heat sources and/or for small available termal power. This paper presents the simulation and performance analysis of working fluids R-134a, R-414B, R-404A and R-407C on ORC with biomass energy as a heat source. Simulation of the ORC system using Cycle Tempo software. The property of working fluids is obtained by using Reference Fluid Properties (Refprop). The best result performance of ORC was shown by working fluid R-404A with thermal efficiency 7.54 % and electric power output ranges between 0.075 kW. This condition operated on turbine inlet temperature at 60 oC, difference turbine working temperature of 15 oC, condensing temperature 25 oC and water boiler mass flow rate 3 lpm.

Experimental Investigation on the Performance of Vortex Tube With Non-Freeze Enhancement

2014 ◽  
Author(s):  
Ran Duan ◽  
Qitai Eri ◽  
Kexin Li
Keyword(s):  
Vortex Tube ◽  
Reverse Flow ◽  
Experimental System ◽  
Working Fluid ◽  
Pressure Reduction ◽  
Mixing Process ◽  
Performance Parameters ◽  
Gas Temperature ◽  
Moist Air ◽  
Vortex Tubes

The vortex tube is a temperature separating device. In some of its applications (e.g., pressure reduction of natural gas), low gas temperature in the cold end is required, which may freeze the impure gas. To solve this problem, a vortex tube with non-freeze enhancement was designed and an experimental system was built. The non-freeze design enabled a reverse flow ejection in the pipe of the cold end. Moist air was used as the working fluid and the performance parameters of five similar vortex tubes were compared in this experiment. The characteristics of freeze based on the experiment were presented. The results indicated that thermal conductivity and mixing process played the most important role to avoid freeze when this vortex tube worked in low level of cold fraction. A feasible way to extend the range of working cold fraction for vortex tube is proposed accordingly.

Rule-Based Mamdani-Type Fuzzy Modeling of Heating and Cooling Performances of Counter Flow Ranque-Hilsch Vortex Tubes with Different Geometric Construction for Brass

2013 ◽  
Vol 372 ◽  
pp. 346-349
Author(s):  
Dilek Nur Ozen ◽  
Adnan Berber ◽  
Kevser Dincer
Keyword(s):  
Experimental Data ◽  
Vortex Tube ◽  
Modeling Technique ◽  
Data Sets ◽  
Geometric Constructions ◽  
Counter Flow ◽  
Rule Based ◽  
Heating And Cooling ◽  
Vortex Tubes

In this study, thermal performances of counter flow Ranque-Hilsch vortex tubes were experimentally investigated and modeled with a Rule Based Mamdani-Type Fuzzy (RBMTF) modeling technique. The vortex tubes were made of brass. Diameter of vortex tube (D) was 10 mm. Length of vortex tube (L) was 10D, 11D, 12D, 13D, 14D. Input parameters (ξ, L/D) and output parameters (ΔTh, ΔTc) were described by RBMTF if-then rules. 45 experimental data sets were used in the training step. R2 for the ΔTh was found to be 99.42 % and R2 for the ΔTc was 99.66 %. The actual values and RBMTF results demonstrated that RBMTF can be successfully used for the determination of heating and cooling performances of counter flow RHVT with different geometric constructions for brass.

scholarly journals Numerical Simulations of Cryogenic Hydrogen Cooling in Vortex Tubes with Smooth Transitions

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1429
Author(s):  
Konstantin I. Matveev ◽  
Jacob Leachman
Keyword(s):  
Vortex Tube ◽  
Vortex Chamber ◽  
Smooth Transition ◽  
Working Fluid ◽  
Hydrogen Energy ◽  
Temperature Separation ◽  
Valuable Characteristic ◽  
Hydrogen Cooling ◽  
Smooth Transitions ◽  
Vortex Tubes

Improving efficiency of hydrogen cooling in cryogenic conditions is important for the wider applications of hydrogen energy systems. The approach investigated in this study is based on a Ranque-Hilsch vortex tube (RHVT) that generates temperature separation in a working fluid. The simplicity of RHVT is also a valuable characteristic for cryogenic systems. In the present work, novel shapes of RHVT are computationally investigated with the goal to raise efficiency of the cooling process. Specifically, a smooth transition is arranged between a vortex chamber, where compressed gas is injected, and the main tube with two exit ports at the tube ends. Flow simulations have been carried out using STAR-CCM+ software with the real-gas Redlich-Kwong model for hydrogen at temperatures near 70 K. It is determined that a vortex tube with a smooth transition of moderate size manifests about 7% improvement of the cooling efficiency when compared vortex tubes that use traditional vortex chambers with stepped transitions and a no-chamber setup with direct gas injection.

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