Evaporation heat transfer coefficient in single circular small tubes for flow natural refrigerants of C3H8, NH3, and CO2

Pamitran, Agus Sunjarianto; Choi, Kwang-Il; Oh, Jong-Taek; Nasruddin, Nasruddin

doi:10.1016/j.ijmultiphaseflow.2011.02.005

Cited by 51 publications

(13 citation statements)

References 12 publications

(21 reference statements)

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“…The results obtained from the comparison of experimental data and theoretical research shown that the good agreement was obtained with experimental data only in the case of Gungor and Winterton correlation. In the case of that correlation the smallest mean absolute deviation of 21.6% was obtained [20,21].…”

Section: Introductionmentioning

confidence: 88%

“…Experimental studies of flow boiling heat transfer of carbon dioxide, ammonia and propane in a single tube with internal diameters of 1.5 mm and 3 mm, were carried out by Pamitran et al [21]. The mass velocity ranged from 50 to 600 kg/m 2 s, heat flux from 5 to 70 kW/m 2 and saturation temperature from 0 o C to 10 o C. The results of experimental research carried out for carbon dioxide have been compared with six popular correlations due to Shah [16], Gungor and Winterton [8], Jung et al [9], Wattelet et al [22], Tran et al [23] and Kandlikar and Steinke [24].…”

Section: Introductionmentioning

confidence: 99%

“…In the paper considered are data due to Docoulombier et al [25], Pamitran et al [21], Mastrullo et al [14,15] [48] and Zhao et al [6]. The range of parameters analyzed in the experimental research is shown in Tab.…”

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: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…[12] przeprowadzili badania wnikania ciepła podczas wrzenia przy przepływie w minikanałach trzech naturalnych czynników chłodniczych, a mianowicie amoniaku, dwutlenku węgla oraz propanu. Badania wrzenia prowadzono w poziomych, ogrzewanych elektrycznie stalowych rurkach o średnicach 1,5 i 3 mm i długości 2,0 m. Celem oceny wpływu wybranych parametrów cieplno-przepływowych na warunki wnikania ciepła dla każdego z czynników, badania prowadzono w zakresie zmian: g T = (50÷600) kg/(m 2 ⋅s), q = (5,0÷70) kW/m 2 , x = 0÷1,0 oraz t n = (0÷10) o C. Autorzy dokonali porównania efektywności wnikania ciepła względem badanych czynników i stwierdzili, wartości współczynników wnikania ciepła dla amoniaku są pośrednie w stounku do wartości uzyskiwanych dla dwutlenku węgla i propanu.…”

Section: Charakterystyka Badań Doświadczalnychunclassified

Analiza procesu wrzenia amoniaku o różnym stopniu zaolejenia

Dratwa¹,

Witczak²

2014

ZN PRz Mechanika

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W pracy scharakteryzowano aktualny stan wiedzy w zakresie procesu wrzenia amoniaku przy przepływie w rurach poziomych. Przedstawiono wyniki badań własnych oraz danych literaturowych dotyczących zjawisk cieplno-przepływo-wych występujących podczas wrzenia amoniaku o różnym stopniu zaolejenia. W oparciu o zebrane wyniki badań dokonano analizy procesu pod kątem określenia wpływu stopnia zaolejenia czynnika oraz właściwości cieczy olejowych na warunki wnikania ciepła. Wskazano także na metody obliczeniowe przydatne dla opisu efektywności wnikania ciepła podczas wrzenia przy przepływie amoniaku w obecności oleju.

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“…With concern over effects from the non-environmentally friendly coolant, investigations have escalated into the application and performance of alternatives in the available MCHS as well as in the compact refrigeration and air-conditioning industries [2][3][4][5][6]. From about 2008, researchers have looked into the global search afforded by evolutionary algorithms for faster investigations of MCHS optimized designs particularly with new coolants.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Square and Circular Ammonia-cooled Microchannel Heat Sink with Genetic Algorithm

Mohd‐Ghazali¹,

Oh²,

Chien³

et al. 2014

Energy Procedia

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Minimization of the thermal resistance and pressure drop of a microchannel heat sink is desirable for effective heat removal which is becoming a serious challenge due to the continuous miniaturization of such cooling systems with increasing high heat generation rate. Optimization of the hydraulic diameter and wall width to channel width ratio of square and circular microchannels to minimize the two objective functions was completed with the multi-objective genetic algorithm (MOGA). Environmentally friendly liquid ammonia was used as the coolant and the thermophysical properties have been obtained based on the average experimental saturation temperatures measured along an ammonia-cooled 3.0 mm internal diameter horizontal microchannel rig. The optimized results showed that with the same hydraulic diameter and pumping power, circular microchannels have lower thermal resistance. Based on the same number of microchannels per square cm, the thermal resistance for the circular channels is lower by 21% at the lowest pumping power and lower by 35% at the highest pumping power than the thermal resistance for the square microchannels. Results obtained at 10 C and 5 C showed no significant difference probably due to the slight difference in properties at these temperatures.

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Evaporation heat transfer coefficient in single circular small tubes for flow natural refrigerants of C3H8, NH3, and CO2

Cited by 51 publications

References 12 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

Analiza procesu wrzenia amoniaku o różnym stopniu zaolejenia

Optimization of Square and Circular Ammonia-cooled Microchannel Heat Sink with Genetic Algorithm

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