Ammonia two-phase flow in a horizontal smooth tube: Flow pattern observations, diabatic and adiabatic frictional pressure drops and assessment of prediction methods

Lima, Ricardo J. da Silva; Quibén, Jesús Moreno; Kuhn, C.; Boyman, Tahsin; Thome, John R.

doi:10.1016/j.ijheatmasstransfer.2008.12.001

Cited by 42 publications

(9 citation statements)

References 36 publications

(84 reference statements)

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“…Da Silva Lima et al [10] observed similar predictions of Lockhart and Martinelli [20], Friedel correlation [22] and Müller Steinhagen and Heck [23] when they performed experiments with ammonia in a smooth horizontal macro channel of 14 mm internal diameter.…”

Section: Comparison With Macro Scale Correlationssupporting

confidence: 59%

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Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Maqbool

Palm

Khodabandeh

2012

International Journal of Thermal Sciences

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a b s t r a c tTwo phase pressure drops were measured for ammonia at a wide range of test conditions in two sizes of vertical mini channels. The test sections were made of stainless steel (AISI 316) tubes with internal diameter of 1.70 mm and 1.224 mm and a uniformly heated length of 245 mm. Experiments were conducted at three saturation temperatures of 23 C, 33 C and 43 C, the heat flux ranging from 15 to 355 kW/m 2 and the mass flux ranging from 100 to 500 kg/m 2 s. The effect of the heat flux, the mass flux, the vapour quality, the saturation temperature and the internal diameter on the two phase pressure drop are presented in this article. Some generalized two phase pressure drop correlations suggested for macro and micro scale channels are examined by comparing them with our experimental data. None of the examined correlations agreed well with the test data. A new correlation (modified form of Tran et al. correlation) is proposed which is able to predict the experimental data with MAD of 16% and 86% of the data is within AE30% range.

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Section: Comparison With Macro Scale Correlationssupporting

confidence: 59%

“…Da Silva Lima et al [10] performed experiments to investigate flow patterns and two phase pressure drop of ammonia in a 14 mm diameter stainless steel tube. The expected trends were observed, i.e.…”

Section: Introductionmentioning

confidence: 99%

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Maqbool

Palm

Khodabandeh

2012

International Journal of Thermal Sciences

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“…It is particularly important to separate the immiscible oil e®ectively at the discharge of the compressor, especially for the plants where mass°ux is high. Da Silva Lima et al 29 reported experimental two-phase°ow pattern together with diabetic boiling and adiabatic two-phase frictional pressure drop for ammonia. The°o w observed patterns during the study included: strati¯ed-wavy, slug-strati¯ed-wavy, slug, intermittent, and annular.…”

Section: Convective Boiling Heat Transfer Characteristicsmentioning

confidence: 99%

Two-Phase Flow Boiling and Condensation Heat Transfer Characteristics of Natural Refrigerants: Review

Heo

Lee

Ren

2013

Int. J. Air-Cond. Ref.

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The existing artificial and chemical refrigerants have been phased out due to environmental concerns, and they have been replaced with environmentally friendly refrigerants. Among them, carbon dioxide, ammonia, and hydrocarbons are paid attention as next generation refrigerants, and their application has been widely expanded. Therefore, in this paper, the latest studies of flow boiling and condensation heat transfer characteristics of carbon dioxide, ammonia, and hydrocarbon are reviewed. The heat transfer characteristics of ammonia and hydrocarbon show the relatively similar trends with the conventional refrigerants compared to those of carbon dioxide. The general trends and recommendable models of flow boiling and condensation heat transfer with carbon dioxide, ammonia, and hydrocarbons are summarized.

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“…Phase-Change in a Tube Park and Hrnjak, 33,35 Bredesen et al, 31 Høgaard Knudsen and Jensen, 32 Zhao and Bansal 34 NH 3 and CO 2 pressure drop Komandiwirya et al, 13 Kabelac and de Buhr, 27 da Silva Lima et al, 49 Park and Hrnjak 35,51 Pure NH 3 and CO 2 Heat Transfer and Pressure Drop in Horizontal Smooth Tubes 87 in Fig. 1(a), and at temperatures around À15 C in Fig.…”

Section: Nh 3 Heat Transfer Withmentioning

confidence: 99%

PURE NH₃ AND CO₂ HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL SMOOTH TUBES FOR NH₃ TWO-STAGE AND NH₃/CO₂ CASCADE REFRIGERATION SYSTEMS: A REVIEW

Park

Hrnjak

2010

Int. J. Air-Cond. Ref.

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This paper presents a review of di®erences and similarities of in-tube heat transfer and pressure drop between ammonia (NH 3 ) and carbon dioxide (CO 2 ) from the perspective of the design of heat exchangers for NH 3 two-stage and CO 2 =NH 3 cascade refrigeration systems. The focus is on di®erences in thermophysical properties and thus di®erent characteristics of heat transfer and pressure drop. A brief summary of published literatures about CO 2 =NH 3 cascade refrigeration systems is provided and literature review of available correlations and developed correlations are presented for°ow boiling and condensation heat transfer and pressure drop. Because of large deviation of calculated values with exiting correlations from measured results, a new correlation to predict°ow condensation heat transfer coe±cients was developed based on experimental results for CO 2 at À15 C. From comparison of measured and predicted values, it is shown that some correlations, previously published in open literature, can be used to calculate°ow boiling heat transfer coe±cients for NH 3 at À20 C, if a°ow pattern can be appropriately determined for a°ow condition. Also, it is presented that existing correlations can predict well the heat transfer coe±cients for CO 2°o w boiling at À15 and À30 C. It is shown that some correlations can predict pressure drop relatively well for NH 3 and CO 2 two-phase°ow. The NH 3 and CO 2°o w evaporation heat transfer and pressure drop characteristics at À40 C are compared with predicted values.

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Ammonia two-phase flow in a horizontal smooth tube: Flow pattern observations, diabatic and adiabatic frictional pressure drops and assessment of prediction methods

Cited by 42 publications

References 36 publications

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Two-Phase Flow Boiling and Condensation Heat Transfer Characteristics of Natural Refrigerants: Review

PURE NH₃ AND CO₂ HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL SMOOTH TUBES FOR NH₃ TWO-STAGE AND NH₃/CO₂ CASCADE REFRIGERATION SYSTEMS: A REVIEW

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Ammonia two-phase flow in a horizontal smooth tube: Flow pattern observations, diabatic and adiabatic frictional pressure drops and assessment of prediction methods

Cited by 42 publications

References 36 publications

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Flow boiling of ammonia in vertical small diameter tubes: Two phase frictional pressure drop results and assessment of prediction methods

Two-Phase Flow Boiling and Condensation Heat Transfer Characteristics of Natural Refrigerants: Review

PURE NH3 AND CO2 HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL SMOOTH TUBES FOR NH3 TWO-STAGE AND NH3/CO2 CASCADE REFRIGERATION SYSTEMS: A REVIEW

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PURE NH₃ AND CO₂ HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL SMOOTH TUBES FOR NH₃ TWO-STAGE AND NH₃/CO₂ CASCADE REFRIGERATION SYSTEMS: A REVIEW