A Common Method for Calculation of Flow Boiling and Flow Condensation Heat Transfer Coefficients in Minichannels With Account of Nonadiabatic Effects

Mikielewicz, Dariusz; Mikielewicz, Jarosław

doi:10.1080/01457632.2011.562728

Cited by 26 publications

(22 citation statements)

References 21 publications

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“…The versatile semiempirical model for calculations of flow boiling and flow condensation due to J. Mikielewicz [34] and the final version due to D. Mikielewicz et al [35][36][37] has been tested for a significant number of experimental data and has returned satisfactory results for the case of the flow boiling process for numerous fluids. The fundamental hypothesis of the model is the fact that heat transfer during flow boiling with bubble generation can be modeled as a sum of two contributions constituting the total energy dissipation in the flow, namely the energy dissipation due to shearing flow without the bubbles and dissipation resulting from the bubble generation.…”

Section: The Modelmentioning

confidence: 99%

“…Additionally present in the calculation procedure is the so called blowing parameter B. That parameter is responsible for evaluation of the nonadiabatic effects present due to modification of shear stress on liquid vapour interface [36,37] and is defined by Eq. (8).…”

Section: The Modelmentioning

confidence: 99%

“…It was authors intention to show the performance of their approach in predicting flow boiling of carbon dioxide, a fluid which usually turns out to be a severe test for heat transfer and pressure drop predictions. In the paper the results of the collected from literature experimental evidence were compared with the predictions of the model [34][35][36][37]. Based on the evidence of comparisons with mentioned above experimental data a correction incorporating the effect of reduced pressure has been applied to the authors own model to provide feasibly the best consistently of the predictions with the experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of flow boiling heat transfer coefficient for carbon dioxide in minichannels and conventional channels

Mikielewicz¹,

Jakubowska²

2016

Archives of Thermodynamics

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In the paper presented are the results of calculations using authors own model to predict heat transfer coefficient during flow boiling of carbon dioxide. The experimental data from various researches were collected. Calculations were conducted for a full range of quality variation and a wide range of mass velocity. The aim of the study was to test the sensitivity of the in-house model. The results show the importance of taking into account the surface tension as the parameter exhibiting its importance in case of the flow in minichannels as well as the influence of reduced pressure. The calculations were accomplished to test the sensitivity of the heat transfer model with respect to selection of the appropriate two-phase flow multiplier, which is one of the elements of the heat transfer model. For that purpose correlations due to Müller-Steinhagen and Heck as well as the one due to Friedel were considered. Obtained results show a good consistency with experimental results, however the selection of two-phase flow multiplier does not significantly influence the consistency of calculations.Keywords: Heat transfer coefficient; Flow boiling; Carbon dioxide; Minichannels Nomenclature B-blowing parameter Bo -boiling number, q/GhLG

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Section: The Modelmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of flow boiling heat transfer coefficient for carbon dioxide in minichannels and conventional channels

Mikielewicz¹,

Jakubowska²

2016

Archives of Thermodynamics

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“…According to the minichannels the Müller-Steinhagen and Heck correlation [20] should be applied with some modification concerning the Con number [21], as in the following equation:…”

Section: Solution Procedures For Determination Of Location Of Dryoutmentioning

confidence: 99%

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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“…Another modification accounts for the influence of heat flux in the bubbly flow. As our objective is to devise a general model applicable both to flow boiling and flow condensation we will attempt to improve the model presented earlier in [2] to include the outlined above effects. Incorporation of the so called "blowing parameter", B, contributes to the liquid film thickening in case of flow condensation and thinning in case of flow boiling.…”

Section: Introductionmentioning

confidence: 99%

Pressure Drop of HFE7000 and HFE7100 in Flow Condensation in Minichannels With Account of Non-Adiabatic Effects

Mikielewicz

Andrzejczyk

Mikielewicz

2014

MATEC Web of Conferences

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Abstract. Flow boiling and flow condensation are often regarded as two opposite or symmetrical phenomena involving the change of phase. There is a temptation to describe both these phenomena with one only correlation. From amongst the structures present in flow boiling and flow condensation at least the annular flow structure seems to be mostly appropriate to the common modeling. However, the shear stress acting between vapor phase and liquid phase is not the same in the respective cases, i.e. flow boiling and flow condensation. Most of modeling of heat transfer in case of condensation inside channels relates the heat transfer coefficient to the friction coefficient. All existing approaches are either the empirical fits to experimental data or form an attempt to combine two major influences to heat transfer, namely the convective flow boiling without bubble generation and nucleate boiling. In the paper the authors present investigations of flow condensation with the use of the HFE7100 and HFE 7000 as a working fluids and their own condensation model inside tubes with account of non-adiabatic effects. The model will be confronted with own data for a new fluid HFE7000 and HFE 7100.

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A Common Method for Calculation of Flow Boiling and Flow Condensation Heat Transfer Coefficients in Minichannels With Account of Nonadiabatic Effects

Cited by 26 publications

References 21 publications

Prediction of flow boiling heat transfer coefficient for carbon dioxide in minichannels and conventional channels

Prediction of flow boiling heat transfer coefficient for carbon dioxide in minichannels and conventional channels

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

Pressure Drop of HFE7000 and HFE7100 in Flow Condensation in Minichannels With Account of Non-Adiabatic Effects

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