Experimental study of forced convective boiling for non-azeotropic refrigerant mixtures R-22/R-124 in horizontal smooth tube

Chiou, Chung-Biau; Lu, D. C.; Liao, Changjiang; Su, Yunxing

doi:10.1016/j.applthermaleng.2008.09.004

Cited by 20 publications

(6 citation statements)

References 16 publications

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“…The correlation (30) seems to be quite general, as confirmed for example by the study by Chiou et al [21].…”

Section: General Methods For Calculation Of Heat Transfer In Two-phasesupporting

confidence: 51%

“…The correction term, P = 2.53 × 10 −3 Re 1.17 Bo 0.6 (R MS − 1) −0.65 , has been established by a method of multiple regression fitting. The pool boiling heat transfer coefficient α P B , is to be calculated from the relation (21). The applied heat flux is incorporated through the boiling number Bo, defined as, Bo = q/(Gh lv ).…”

Section: General Methods For Calculation Of Heat Transfer In Two-phasementioning

confidence: 99%

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Thermal-hydraulic issues of flow boiling and condensation in organic Rankine cycle heat exchangers

Mikielewicz¹,

Mikielewicz²

2012

Archives of Thermodynamics

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In the paper presented are the issues related to the design and operation of micro heat exchangers, where phase changes can occur, applicable to the domestic micro combined heat and power (CHP) unit. Analysed is the stability of the two-phase flow in such unit. A simple hydraulic model presented in the paper enables for the stability analysis of the system and analysis of disturbance propagation caused by a jump change of the flow rate. Equations of the system dynamics as well as properties of the working fluid are strongly non-linear. A proposed model can be applicable in designing the system of flow control in micro heat exchangers operating in the considered CHP unit.

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“…The correlation (30) seems to be quite general, as confirmed for example by the study by Chiou et al [21].…”

Section: General Methods For Calculation Of Heat Transfer In Two-phasesupporting

confidence: 51%

Section: General Methods For Calculation Of Heat Transfer In Two-phasementioning

confidence: 99%

Thermal-hydraulic issues of flow boiling and condensation in organic Rankine cycle heat exchangers

Mikielewicz¹,

Mikielewicz²

2012

Archives of Thermodynamics

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“…The proposed model was thoroughly tested for the conditions of flow boiling-see for example Mikielewicz [13], showing satisfactory performance. A good agreement has also been obtained in case of fluids, for which relation (9) was not tested yet [14]. That encouraged us to pursue further the extension of the model to flow condensation conditions.…”

Section: Results Of Calculationsmentioning

confidence: 60%

“…The correlation (9) seems to be quite general, as confirmed for example by the study by Chiou et al [14].…”

Section: Dissipation-based Model Of Flow Boilingmentioning

confidence: 56%

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

Mikielewicz

2011

Heat Transfer Engineering

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Flow boiling and flow condensation are often regarded as two opposite or symmetrical phenomena; however, their description with a single correlation has yet to be suggested. In the case of flow boiling in minichannels there is mostly encountered the annular flow structure, where bubble generation is not present. A similar picture holds for the case of inside tube condensation, where annular flow structure predominates. In such a case the heat transfer coefficient is primarily dependent on the convective mechanism. In this article a method developed earlier by the authors is applied to calculations of the heat transfer coefficient for flow condensation. The modifications of interface shear stresses between flow boiling and flow condensation are considered through incorporation of the so-called blowing parameter, which differentiates between these two modes of heat transfer. Satisfactory consistency with well-established correlations for condensation has been found, as well as with selected experimental data.

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“…In the paper that method has been applied to predictions of heat transfer coefficient in flow condensation and has been verified by experimental data due to Bohdal et al [1] and also compared to Cavallini's correlation (5), Thome's correlation (6), and Bohdal et al (8) correlation. The comparison is satisfactory.…”

Section: Discussionmentioning

confidence: 94%

Comparative study of flow condensation in conventional and small diameter tubes

Mikielewicz¹,

Andrzejczyk²

2012

Archives of Thermodynamics

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Flow boiling and flow condensation are often regarded as two opposite or symmetrical phenomena. Their description however with a single correlation has yet to be suggested. In the case of flow boiling in minichannels there is mostly encountered the annular flow structure, where the bubble generation is not present. Similar picture holds for the case of inside tube condensation, where annular flow structure predominates. In such case the heat transfer coefficient is primarily dependent on the convective mechanism. In the paper a method developed earlier by the first author is applied to calculations of heat transfer coefficient for inside tube condensation. The method has been verified using experimental data from literature on several fluids in different microchannels and compared to three well established correlations for calculations of heat transfer coefficient in flow condensation. It clearly stems from the results presented here that the flow condensation can be modeled in terms of appropriately devised pressure drop.

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Experimental study of forced convective boiling for non-azeotropic refrigerant mixtures R-22/R-124 in horizontal smooth tube

Cited by 20 publications

References 16 publications

Thermal-hydraulic issues of flow boiling and condensation in organic Rankine cycle heat exchangers

Thermal-hydraulic issues of flow boiling and condensation in organic Rankine cycle heat exchangers

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

Comparative study of flow condensation in conventional and small diameter tubes

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