Recent Advances in Experimental Techniques for Flow and Mass Transfer Analyses in Thermal Separation Systems

Hampel, Uwe; Schubert, Markus; Döß, Alexander; Sohr, Johanna; Vishwakarma, Vineet; Repke, Jens‐Uwe; Gerke, Sören Jakob; Leuner, Hannes; Rädle, Matthias; Kapoustina, Viktoria; Schmitt, Lucas; Grünewald, Marcus; Brinkmann, Jost H.; Plate, D. E. A.; Kenig, Eugeny Y.; Lutters, Nicole; Bolenz, Lukas; Buckmann, Felix; Toye, Dominique; Arlt, Wolfgang; Linder, Thomas; Hoffmann, Rainer; Klein, Harald; Rehfeldt, Sebastian; Winkler, Thomas; Bart, Hans‐Jörg; Wirz, Dominic; Schulz, J.; Scholl, Stephan; Augustin, Wolfgang; Jasch, Katharina; Schlüter, Florian; Schwerdtfeger, Natalie; Jahnke, S.; Jupke, Andreas; Kabatnik, Christoph; Braeuer, Andreas; D’Auria, Mirko; Runowski, Thomas; Casal, Maria Francisco; Becker, K.; David, A. Reay; Górak, Andrzej; Skiborowski, Mirko; Groß, Kai; Qammar, Hina

doi:10.1002/cite.202000076

Cited by 26 publications

(15 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To investigate the foam formation and behavior in the transparent rectangular measurement cell visually, the transparent packing section has been observed with a high-speed camera (Phantom VEO 640s) by utilizing the light-induced fluorescence (LIF) method as previously described for film flow measurements in Hampel et al [15]. LIF ensured highcontrast pictures of the liquid phase and foam within the structured packing.…”

Section: Experimental Setupsmentioning

confidence: 99%

Foam in Absorption Columns with Structured Packings – Part 1: Characterization

et al. 2022

Self Cite

View full text Add to dashboard Cite

Foam in absorption and distillation processes is one of the main reasons for malfunctions in columns including higher pressure loss, lower throughput, and lower mass transfer rates leading to a reduction in separation efficiency. Detailed investigations on the foam formation and its behavior in structured packings are conducted using two different scales: a transparent rectangular measurement cell and a DN300 column. The influence of maldistributions in structured packing is discussed along with a first-time identified foam-related hysteresis effect. Ad-and disadvantages of fully wetted film flow and partially wetted rivulet flow on foam formation are discussed in detail. Overall, structured packings without a microstructure show a reduced foam formation compared to structured packings with a microstructure.

show abstract

Section: Experimental Setupsmentioning

confidence: 99%

Foam in Absorption Columns with Structured Packings – Part 1: Characterization

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…2, the new WMS model is composed of three parts: Excitation and amplification circuits and the mesh-sensor. As in the basic model, the potential field of the 3D geometry is calculated by (1). However, the input and output signals are conditioned by the external circuits, which are represented by macromodels.…”

Section: Buffer Excitation Systemmentioning

confidence: 99%

“…In contrast to Eq. (2) of the basic FEM model, the measurement of a single crossing-point in the new approach is modelled by applying an AC signal in the input of a buffer and measuring the voltage signal on the output of the transimpedance amplifier (the potential distribution in the geometry domain is solved by (1) as in the basic model). Thus, a matrix containing the absolute admittance distribution is obtained employing the same calibration procedure from ( 4)-( 6), but replacing the current I (in eq.…”

Section: ) External Circuit Modeling (Macromodel)mentioning

confidence: 99%

See 1 more Smart Citation

Combined Finite Element and Electronic Circuit Model of a Wire-Mesh Sensor

et al. 2021

Self Cite

View full text Add to dashboard Cite

A new wire-mesh sensor model based on electric field and circuit simulations is presented. In our approach, the excitation and amplification stages of the capacitance WMS are created as macromodels and coupled to the electrodes of a 3D geometry of the sensor. Thus, the effects caused by nonideal characteristics of the amplifiers are considered (e.g. finite open-loop gain and bandwidth). In order to evaluate the performance of the model, a static validation based on phantom measurement was performed. The phantoms were created with paraffin to emulate typical flow regimes, i.e. annular, slug and bubble flow. A mapping containing the position and the electrical properties of the patterns was obtained by image processing and incorporated to the field simulation. Hence the numerical simulations could be directly compared to the experimental data. The results show that coupling the external circuits to the capacitance WMS model is crucial to provide reliable synthetic data.

show abstract

“…Wire-mesh sensors were introduced by [ 1 ] and evolved into well-established scientific instruments for measuring the spatio-temporal phase distribution of two-phase flows. Due to the versatile measurement principle, which is based on differentiating phases by their electrical conductivities, the fields of application steadily extended from fundamental research on thermohydraulic systems related to nuclear power stations [ 2 ] across solar thermal applications [ 3 ] up to chemical engineering research [ 4 , 5 ]. For the purpose of measuring multiphase flows of non-conducting fluids, e.g., in the oil and gas industry, also a capacitance-based measurement principle was developed, cf.…”

Section: Introductionmentioning

confidence: 99%

Temperature Compensation for Conductivity-Based Phase Fraction Measurements with Wire-Mesh Sensors in Gas-Liquid Flows of Dilute Aqueous Solutions

Wiedemann

Dias

Schleicher

et al. 2020

Sensors

Self Cite

View full text Add to dashboard Cite

Wire-mesh sensors are well-established scientific instruments for measuring the spatio-temporal phase distribution of two-phase flows based on different electrical conductivities of the phases. Presently, these instruments are also applied in industrial processes and need to cope with dynamic operating conditions increasingly. However, since the quantification of phase fractions is achieved by normalizing signals with respect to a separately recorded reference measurement, the results are sensitive to temperature differences in any application. Therefore, the present study aims at proposing a method to compensate temperature effects in the data processing procedure. Firstly, a general approach is theoretically derived from the underlying measurement principle and compensation procedures for the electrical conductivity from literature models. Additionally, a novel semi-empirical model is developed on the basis of electrochemical fundamentals. Experimental investigations are performed using a single-phase water loop with adjustable fluid temperature in order to verify the theoretical approach for wire-mesh sensor applications and to compare the different compensation models by means of real data. Finally, the preferred model is used to demonstrate the effect of temperature compensation with selected sets of experimental two-phase data from a previous study. The results are discussed in detail and show that temperature effects need to be handled carefully—not merely in industrial applications, but particularly in laboratory experiments.

show abstract

Recent Advances in Experimental Techniques for Flow and Mass Transfer Analyses in Thermal Separation Systems

Cited by 26 publications

References 41 publications

Foam in Absorption Columns with Structured Packings – Part 1: Characterization

Foam in Absorption Columns with Structured Packings – Part 1: Characterization

Combined Finite Element and Electronic Circuit Model of a Wire-Mesh Sensor

Temperature Compensation for Conductivity-Based Phase Fraction Measurements with Wire-Mesh Sensors in Gas-Liquid Flows of Dilute Aqueous Solutions

Contact Info

Product

Resources

About