Experimental investigation and correlation of two-phase frictional pressure drop of R410A–oil mixture flow boiling in a 5mm microfin tube

Ding, Guoliang; Hu, Haitao; Huang, Xiaolu; Deng, Bin; Gao, Yifeng

doi:10.1016/j.ijrefrig.2008.08.009

Cited by 41 publications

(25 citation statements)

References 23 publications

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“…Many investigations have been done to improve the flow characteristics and friction around grooves [2][3][4][5][6][7][8][9]. In past years, most researches focused on rectangular grooves [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

Sunu¹,

Rasta²

2017

Acta Polytech

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Abstract. This investigation was performed to experimentally investigate the enhancement of heat transfer and the friction of an annulus in a double pipe heat exchanger system with rectangular grooves in the turbulent flow regime. The shell is made of acrylic and its diameter is 28 mm. The tube is made of aluminium and its diameter is 20 mm. Grooves were incised in the annulus room with a circumferential pattern, with a groove space of 2 mm, a distance between the grooves of 8 mm and a groove height of 0.3 mm. The experiments consist of temperature and pressure measurement and a flow visualization. Throughout the investigation, the cold fluid flowed in the annulus room. The Reynold number of cold fluid varied from about 31981 to 43601 in a counter flow condition. The volume flow rate of hot fluid remains constant with Reynold number about 30904. Result showed the effect of grooves, which are applied in the annulus room. The grooves induce the pressure drop, the pressure drop in the grooved annulus was greater by about 15.88 % to 16.72 % than the one in the smooth annulus. The total heat transfer enhancement is of 1.09-1.11. Moreover, the use of grooves in the annulus of the heat exchanger not only increase the heat transfer process, but also increase the pressure drop, which is related to the friction factor.

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Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

Sunu¹,

Rasta²

2017

Acta Polytech

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“…The boiling process inside horizontal tubes with micro-fins was discussed in [3][4][5][6][7][8]. The effect of the shape of the horizontal tube (circular cross-section w/h=1 and ellipsoidal crosssections w/h=2, w/h=4) on heat transfer coefficients and flow resistance values of R410A was examined by Kim et al [9].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the boiling process of refrigerants with high temperature glide and low gwp

Niezgoda-Żelasko

2017

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Enhancement of the boiling process of refrigerants with high temperature glide and low gwp Intensyfikacja procesu wrzenia czynników chłodniczych o dużym poślizgu temperaturowym i niskim gwp AbstractThe paper presents the results of experimental studies of the enhancement of the boiling process of a zeotropic agent with high temperature glide inside tubes at a low heat flux density. It discusses the effect of three types of inserts on the heat transfer process and the flow resistances during boiling of R407C in vertical tubes. The experimental studies covered measurements of heat transfer coefficient values, flow resistance values and thermal efficiency in the measurement section.Keywords: boiling, heat transfer enhancement inserts, heat transfer coefficients, flow resistances Sreszczenie Przedmiotem prezentowanej publikacji są wyniki badań eksperymentalnych intensyfikacji procesu wrzenia wewnątrz rur czynnika zeotropowego z dużym poślizgiem temperaturowym w warunkach niskich gęstości strumieni ciepła. W ramach pracy omówiono wpływ zastosowania trzech rodzajów wkładek na proces wymiany ciepła czynnika R407C i opory przepływu podczas wrzenia w rurach pionowych. Wyniki badań doświadczalnych obejmują pomiary wartości współczynników przejmowania ciepła, oporów przepływu oraz wydajności cieplnej uzyskiwanej w odcinku pomiarowym.Słowa kluczowe: wrzenie, wkładki intensyfikujące wymianę ciepła, współczynniki przejmowania ciepła, opory przepływu

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“…Choi and Orchard (1997) reveal about turbulence management using passive device for momentum transfer. Ding et al (2009) present a correlation to predict frictional pressure drop of R410A-oil mixture inside internal spiral grooved microfin tube. Alam and Yong Kim (2012) conducted mixing analysis in microchannel with rectangular grooves.…”

Section: Introductionmentioning

confidence: 99%

Temperature Approach Optimization in the Double Pipe Heat Exchanger with Groove

Sunu

Anakottapary

Santika

2016

MATEC Web of Conferences

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Heat transfer in double pipe heat exchanger with circumference-rectangular grooves has been investigated experimentally. The volume flowrate of cold and hot water were varied to determine its influence on the approach temperature of the outlet terminals. In this experimental design, the grooves were incised in annular room that is placed on the outside surface of the inner pipe. The shell diameter is 38.1 mm and tube diameter 19.4 mm with 1 m length, which is made of aluminum. The flow pattern of the two fluids in the heat exchanger is a parallel flow. The working fluid is water with volume flow rate of 27.1, 23.8 and 19.8 l/minute. The temperature of water on the inlet terminals are 50±1 0 C for hot stream and 30±1 0 C for cold stream. Temperature measurements conducted on each terminal of the inlet and outlet heat exchanger. The results showed that the grooves induced the approach temperature. The change of the approach temperature from the grooves compared to that of without grooves decreased by 37.9%. This phenomenon indicates an increase in heat transfer process and performance of the heat exchanger. Groove improves the heat surface area of the inner pipe, increasing the momentum transfer and in the other hand, reducing the weight of heat exchangers itself.

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Experimental investigation and correlation of two-phase frictional pressure drop of R410A–oil mixture flow boiling in a 5mm microfin tube

Cited by 41 publications

References 23 publications

Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

Enhancement of the boiling process of refrigerants with high temperature glide and low gwp

Temperature Approach Optimization in the Double Pipe Heat Exchanger with Groove

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