Experimental investigation of dryout of SES 36, R134a, R123 and ethanol in vertical small diameter tubes

Mikielewicz, Dariusz; Wajs, Jan; Gliński, Michał; Zrooga, Abdul-Baset R.S.

doi:10.1016/j.expthermflusci.2012.08.018

Cited by 29 publications

(17 citation statements)

References 11 publications

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“…With some correlation good agreement was obtained but with the others quite poor. Markedly, a very good agreement has been found with the correlation for minichannels due to Mikielewicz et al [2]. Additionally, they proposed their own correlation for prediction of heat flux at dryout conditions.…”

Section: Introductionsupporting

confidence: 61%

“…Verification of the model is based on own experiments [2] conducted for minitubes with diameters of 1.15 mm and 2.3 mm, with ethanol as a test fluid. Obtained experimentally results were compared with predictions of the five-equation model, described above as well as the three-equation model due to Gliński [16].…”

Section: Comparison Of Calculation Results With Experimental Datamentioning

confidence: 99%

“…Researchers placed a lot of efforts to get the results of dryout dependence on the applied working fluid, mass flow rate, saturation temperature, vapour quality, etc. Mikielewicz et al [2] reported the experimental results regarding four fluids in two small diameter tubes. They observed that dryout heat flux increased with: (1) increase of mass velocity, (2) decrease of vapor quality and (3) increase of tube diameter.…”

Section: Introductionmentioning

confidence: 99%

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Determination of dryout localization using a five-equation model of annular flow for boiling in minichannels

Wajs¹,

Mikielewicz²

2017

Archives of Thermodynamics

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Detailed studies have suggested that the critical heat flux in the form of dryout in minichannels occurs when the combined effects of entrainment, deposition, and evaporation of the film make the film flow rate go gradually and smoothly to zero. Most approaches so far used the mass balance equation for the liquid film with appropriate formulations for the rate of deposition and entrainment respectively. It must be acknowledged that any discrepancy in determination of deposition and entrainment rates, together with cross-correlations between them, leads to the loss of accuracy of model predictions. Conservation equations relating the primary parameters are established for the liquid film and vapor core. The model consists of three mass balance equations, for liquid in the film as well as two-phase core and the gas phase itself. These equations are supplemented by the corresponding momentum equations for liquid in the film and the two-phase core. Applicability of the model has been tested on some experimental data.

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Section: Introductionsupporting

confidence: 61%

Section: Comparison Of Calculation Results With Experimental Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of dryout localization using a five-equation model of annular flow for boiling in minichannels

Wajs¹,

Mikielewicz²

2017

Archives of Thermodynamics

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“…The heating element for FC-72 flowing in each minichannel (1) is the heating foil made of super alloy Haynes 230 (2). Temperature of the outer foil surface are measured using two contactless measurement methods: liquid crystal thermography and infrared thermography.…”

Section: Experimental Set Upmentioning

confidence: 99%

“…The applications of IRT have been numerous. For instance, the method was used to assess the increase in the dryout heat flux for four fluids flowing through two smalldiameter silver tubes [2]. It proved to be useful to analyze the thermo-hydrodynamics of the initial phase of the hydrodynamically fully developed but thermally developing internal laminar flow of water in a square cross-sectional minichannel.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two methods for contactless surface temperature measurement

Piasecka

Michalski

Strąk

2016

EPJ Web of Conferences

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Abstract. The aim of the paper is to determine the temperature filed of the heating surface on the basis of temperature measurements taken by liquid crystal thermography and infrared thermography applied in boiling heat transfer research during FC-72 flow in minichannels, and to compare them. The essential part of the experimental stand is the test section with two parallel rectangular minichannels, each 1.7 mm deep, 24 mm wide and 360 mm long. It is possible to observe the channel surfaces through panes: of the first minichannel allows observing foil temperature changes on the plain side due to liquid crystal thermography (LCT), which required treating the foil surface with thermochromic liquid crystals, of the other minichannel enables detecting outer glass or foil surface temperature changes due to infrared thermography (IRT). Comparison of the results of the measurements are presented in graphical form as thermographs and as heating surface temperature vs. minichannel length. The differences between two sets of measurement data concerning the temperature of the heating surface obtained with LCT and IRT, were analyzed using: Pearson linear correlation coefficient, determination coefficient, Experimental Method Error and Method Accuracy. The comparative data analysis shows that similar values and distributions of the surface temperature were obtained from both techniques.

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