Measurement of the void fraction and maximum dry angle using electrical capacitance tomography applied to a 7 mm tube with R-134a

Roman, Abdeel J.; Cronin, Joseph M.; Ervin, Jamie S.; Byrd, Larry W.

doi:10.1016/j.ijrefrig.2018.07.026

Cited by 15 publications

(4 citation statements)

References 18 publications

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“…The two-phase flow structures were recorded in combination with another method that measured void fraction. For instance, Roman et al [7] and Caniere et al [8] combined the camera recording of two-phase flow structures with different electrical capacitance methods for two-phase flows in small diameter tubes.…”

Section: Digital Image Processing Methodsmentioning

confidence: 99%

“…Figure 1a shows the diagram of the flow loop. The heated fluid-in this case, waterleaves the channel (1) towards the cooler (5) and is directed through the rotameter (7), filter (8), and precision micropump (9) to the pressure control device (10) with elastic rubber diaphragm. The compressed air pressure (12) determines the pressure in the flow system.…”

Section: Experimental Standmentioning

confidence: 99%

See 1 more Smart Citation

Novel Twofold Use of Photographic Technique for Simultaneous Flow Boiling Image Recording and Void Fraction Computation in a Mini-Channel Experiment

Płaczkowski¹,

Grabowski

Poniewski

2021

Energies

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The paper presents a novel twofold use of the photographic technique for flow boiling heat transfer investigation in the horizontal mini-channel. The dedicated measurement system was constructed to record basic thermal and flow parameters, i.e., boiling liquid inlet and outlet temperatures and pressures, and also temperatures inside the heating block to calculate heat flux going into the liquid. A high-speed video camera equipped with synchronous movement system was applied to combine the recording of two-phase flow images with simultaneous local void fraction measurements both based on the same photographic data set. The data were collected, managed, and refined with the scripts developed in the MathWorks Matlab 2019b environment. The synchronous use of two intelligent techniques in the scripts, i.e., the background subtraction technique and the statistical analysis of individual pictures allowed obtaining reliable experimental results. The proposed method of the void fraction determination ensures high measurement accuracy.

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Section: Digital Image Processing Methodsmentioning

confidence: 99%

Section: Experimental Standmentioning

confidence: 99%

Novel Twofold Use of Photographic Technique for Simultaneous Flow Boiling Image Recording and Void Fraction Computation in a Mini-Channel Experiment

Płaczkowski¹,

Grabowski

Poniewski

2021

Energies

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show abstract

“…It also has the advantages of easy assembling, fast imaging, and low cost. Therefore, many studies have been made on its application to image reconstruction for room temperature fluids, such as in fluidized beds [10,11], water/oil flows [12], gas/oil flows [13][14][15][16], and other multi-phase conditions [17,18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Landweber Coupled Least Square Support Vector Regression Algorithm for Electrical Capacitance Tomography for LN2–VN2 Flow

Tian,

Gao,

Xia

et al. 2023

Energies

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The electric capacitance tomography (ECT) technique has been widely used in phase distribution reconstruction, while the practical application raised nonideal noise and other errors for cryogenic conditions, requiring a more accurate algorithm. This paper develops a new image reconstruction algorithm for ECT by coupling the traditional Landweber algorithm with the least square support vector regression (LSSVR) for cryogenic fluids. The performance of the algorithm is quantitatively evaluated by comparing the inversion images with the experimental results for both the room temperature working medium with the dielectric constant ratio close to cryogenic fluid and the cryogenic fluid of liquid nitrogen/nitrogen vapor (LN2-VN2). The inversion images based on the conventional LBP and Landweber algorithms are also presented for comparison. The benefits and drawbacks of the developed algorithms are revealed and discussed, according to the results. It is demonstrated that the correlated coefficients of the images based on the developed algorithm reach more than 0.88 and a maximum of 0.975. In addition, the minimum void fraction error of the algorithm is reduced to 0.534%, which indicates the significant optimization of the LSSVR coupled method over the Landweber algorithm.

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“…However, although R-410A is of zero ODP, it has a high GWP, even higher than that of R-134a. The goal of this work concentrates on investigating the performance of a small refrigerator with a drop-in refrigerant R-410A in place of the original refrigerant R-134a to examine the possibility of replacement [7,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of using different refrigerant gases on refrigerator performance

Alrwashdeh¹,

Ammari²,

Hammad³

et al. 2022

JJE

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An experimental study of the performance of a refrigerator using two refrigerants R-134a and R-410A has been conducted. The R-134a was the original design refrigerant, while the R-410A was the drop-in refrigerant. The study was performed on a small refrigerator charged with each refrigerant alone at nearly the same ambient conditions. Temperatures at various locations in the refrigeration system were measured using thermocouples during the running of the experiments, and the data collected were processed into performance refrigeration parameters. The results have indicated that both the refrigeration capacity and coefficient of performance were remarkably higher for the refrigerant R-410a by about 23 and 24%, respectively.

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Measurement of the void fraction and maximum dry angle using electrical capacitance tomography applied to a 7 mm tube with R-134a

Cited by 15 publications

References 18 publications

Novel Twofold Use of Photographic Technique for Simultaneous Flow Boiling Image Recording and Void Fraction Computation in a Mini-Channel Experiment

Novel Twofold Use of Photographic Technique for Simultaneous Flow Boiling Image Recording and Void Fraction Computation in a Mini-Channel Experiment

Evaluation of Landweber Coupled Least Square Support Vector Regression Algorithm for Electrical Capacitance Tomography for LN2–VN2 Flow

Experimental investigation of the effect of using different refrigerant gases on refrigerator performance

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Measurement of the void fraction and maximum dry angle using electrical capacitance tomography applied to a 7 mm tube with R-134a

Cited by 15 publications

References 18 publications

Novel Twofold Use of Photographic Technique for Simultaneous Flow Boiling Image Recording and Void Fraction Computation in a Mini-Channel Experiment

Novel Twofold Use of Photographic Technique for Simultaneous Flow Boiling Image Recording and Void Fraction Computation in a Mini-Channel Experiment

Evaluation of Landweber Coupled Least Square Support Vector Regression Algorithm for Electrical Capacitance Tomography for LN2–VN2 Flow

Experimental investigation of the effect of using different refrigerant gases on refrigerator performance

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Measurement of the void fraction and maximum dry angle using electrical capacitance tomography applied to a 7 mm tube with R-134a