The effects of corrugation pitch on the condensation heat transfer coefficient and pressure drop of R-134a inside horizontal corrugated tube

Laohalertdecha, Suriyan; Wongwises, Somchai

doi:10.1016/j.ijheatmasstransfer.2010.01.037

Cited by 122 publications

(27 citation statements)

References 25 publications

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“…[1][2][3][4] Experimental studies usually involve expensive and sophisticated equipment that is out of reach of school laboratory facilities. [3][4][5][6] In this paper we show how to investigate quantitatively the sounds produced by a flexible sound tube corrugated on the inside by using educational equipment readily available in school laboratories, such as the oscilloscope, the microphone, the anemometer, and the air pump. We show that it is possible for students to study the discontinuous spectrum of sounds produced by a flexible corrugated tube and go even further, computing the speed of sound in air with a simple experimental procedure.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

A Simple Experiment to Explore Standing Waves in a Flexible Corrugated Sound Tube

Amorim¹,

Sousa²,

Carvalho³

et al. 2011

The Physics Teacher

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Sound tubes, pipes, and singing rods are used as musical instruments and as toys to perform amusing experiments. In particular, corrugated tubes present unique characteristics with respect to the sounds they can produce; that is why they have been studied so intensively, both at theoretical and experimental levels.1–4 Experimental studies usually involve expensive and sophisticated equipment that is out of reach of school laboratory facilities.3–6 In this paper we show how to investigate quantitatively the sounds produced by a flexible sound tube corrugated on the inside by using educational equipment readily available in school laboratories, such as the oscilloscope, the microphone, the anemometer, and the air pump. We show that it is possible for students to study the discontinuous spectrum of sounds produced by a flexible corrugated tube and go even further, computing the speed of sound in air with a simple experimental procedure.

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Section: Experimental Procedures and Resultsmentioning

confidence: 99%

A Simple Experiment to Explore Standing Waves in a Flexible Corrugated Sound Tube

Amorim¹,

Sousa²,

Carvalho³

et al. 2011

The Physics Teacher

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“…Wongwises and Polsongkarm [11] investigated the evaporation heat transfer and pressure drop of HFC-134a in a helically coiled concentric tube-in-tube heat exchanger. Condensation of R134a flowing inside helicoidal pipe investigated by Laohalertdecha and Wongwises [12]. Their obtained results show that, the average heat flux of the refrigerant flow increases with the water flow rate.…”

Section: Introductionmentioning

confidence: 98%

“…The obtained results show that, the condensation heat transfer coefficient from the refrigerant side for the helical pipe at the inclined position is the highest, and the vertical position is the lowest. Laohalertdecha and Wongwises [4] studied the effect of corrugation pitch on the condensation heat transfer coefficient and pressure drop of R-134a inside horizontal corrugated tube. Murai et al [5] studied structure of airwater two-phase flow in helically coiled tubes.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study for Condensation Heat Transfer Inside Helical Coil

Raboh¹,

Mostafa²,

Ali³

et al. 2011

Evaporation, Condensation and Heat Transfer

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The theoretical analysis and modeling of heat and mass transfer rates produced in evaporation and condensation processes are significant issues in a design of wide range of industrial processes and devices. This book includes 25 advanced and revised contributions, and it covers mainly (1) evaporation and boiling, (2) condensation and cooling, (3) heat transfer and exchanger, and (4) fluid and flow. The readers of this book will appreciate the current issues of modeling on evaporation, water vapor condensation, heat transfer and exchanger, and on fluid flow in different aspects. The approaches would be applicable in various industrial purposes as well. The advanced idea and information described here will be fruitful for the readers to find a sustainable solution in an industrialized society.

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“…They found that the internally grooved tube provides the Nusselt number and friction factor higher than the smooth tube. The effects of the helically grooved tube on heat transfer and pressure drop of R−134a were experimentally studied by Laohalertdecha and Wongwises (2010).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on turbulent forced convection and heat transfer characteristic in spirally semicircle-grooved tube

Promthaisong

Boonloi

Jedsadaratanachai

2016

Int J Mech Mater Eng

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Turbulent forced convection and heat transfer structure in the spirally semicircle-grooved tube heat exchanger are numerically examined. The computational problem is solved by finite volume method (FVM) with the SIMPLE algorithm. The influences of groove depth and helical pitch on heat transfer, pressure loss, and thermal performance are investigated for turbulent regime, Re = 5000-20,000. As a result, the swirling flow is found through the test section due to the groove on the tube wall. The flow structure in the spirally semicircle-grooved tube can separate into two types: main and secondary swirling flows. The main swirling flow is found in all cases, while the secondary swirling flow is detected when DR ≥ 0.06. The swirling flow disturbs the thermal boundary layer on the tube wall that is an important reason for heat transfer augmentation. In range studies, the enhancements on heat transfer and friction loss are around 1.16-1.96 and 1.2-10.8 time above the smooth tube, respectively. The optimum thermal performance is around 1.11, which detected at DR = 0.06, PR = 1.4, and Re = 5000. The correlations of the Nusselt number and friction factor for the spirally semicircle-grooved tube with PR = 1.4 are produced to help to design the tube heat exchanger.

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The effects of corrugation pitch on the condensation heat transfer coefficient and pressure drop of R-134a inside horizontal corrugated tube

Cited by 122 publications

References 25 publications

A Simple Experiment to Explore Standing Waves in a Flexible Corrugated Sound Tube

A Simple Experiment to Explore Standing Waves in a Flexible Corrugated Sound Tube

Experimental Study for Condensation Heat Transfer Inside Helical Coil

Numerical investigation on turbulent forced convection and heat transfer characteristic in spirally semicircle-grooved tube

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