Evaluation of the rohsenow correlation through experimental pool boiling of halocarbon refrigerants on cylindrical surfaces

Jabardo, José María Sáiz; Silva, E. Fockink da; Ribatski, Gherhardt; Barros, Samuel Freire de

doi:10.1590/s1678-58782004000200015

Cited by 49 publications

(36 citation statements)

References 10 publications

(5 reference statements)

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“…However, this conclusion neither takes into account pressure nor explicit roughness effects. Recently, Saiz Jabardo et al [14] curve fitted their own experimental results of refrigerants R-11, R-123, R-12, and R-134a boiling on cylindrical copper, brass, and stainless steel surfaces at several reduced pressures and surface average roughness, Ra, varying between 0.08 μm and 3.30 μm. Following an analysis similar to that of Vachon et al [13], they obtained the following values for exponents "r" and "s": 0.18 and 1.03.…”

Section: Literature Surveymentioning

confidence: 99%

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An Overview of Surface Roughness Effects on Nucleate Boiling Heat Transfer~!2009-10-31~!2010-01-01~!2010-04-16~!

Jabardo¹

2010

TOTPJ

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Abstract:The paper aims at an overview of heating surface microstructure effects on nucleate boiling heat transfer. A comprehensive chronological literature survey is presented followed by an analysis of the results of an experimental investigation. Boiling data of refrigerants R-134a and R-123 on 19 mm diameter copper and brass tubes of average surface roughness varying from 0.07 μm to 10.5 μm have been gathered under the present investigation. Though most of the data confirm previous literature trends, according to which the heat transfer coefficient increases with surface roughness, very rough surfaces present a peculiar behavior with respect to that of the smoother surfaces (Ra<3.0 μm). Heat transfer performance of very rough surfaces is superior to the smoother ones at low heat fluxes (q<20 kW/m 2 ). However, decay in their thermal performance is observed in the high heat fluxes range. An in depth analysis of the effect of roughness on the slope, "m" of the h vs q curves has been performed with a general conclusion being that "m" is affected not only by de pressure but also by the surface roughness. Finally, an analysis of the active cavities density is performed using some models from the literature in order to evaluate the effect of surface roughness in cavity activation. The obtained results are generally inconclusive. However, it has been determined that surface microstructure effects must not be neglected in future models.

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Section: Literature Surveymentioning

confidence: 99%

“…The coefficient "C" is indeed a surface-liquid combination parameter, with values varying in the range between 0.95 and 1.30 [14].…”

Section: Literature Surveymentioning

confidence: 99%

An Overview of Surface Roughness Effects on Nucleate Boiling Heat Transfer~!2009-10-31~!2010-01-01~!2010-04-16~!

Jabardo¹

2010

TOTPJ

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“…Nucleate pool boiling of R-11 on cylindrical copper surfaces at reduced pressure was investigated [34]. The Rohsenow correlation was applied to nucleate boiling of halocarbon refrigerants over cylindrical surfaces and a correlation was developed [35].…”

Section: Refrigerants and Dielectric Fluidsmentioning

confidence: 99%

Research progresses and future directions on pool boiling heat transfer

Kumar¹,

Bhutani²,

Khatak³

2015

J. Mech. Eng. Sci.

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This paper reviews the previous work carried on pool boiling heat transfer during heating of various liquids and commodities categorized as refrigerants and dielectric fluids, pure liquids, nanofluids, hydrocarbons and additive mixtures, as well as natural and synthetic colloidal solutions. Nucleate pool boiling is an efficient and effective method of boiling because high heat fluxes are possible with moderate temperature differences. It is characterized by the growth of bubbles on a heated surface. It occurs during boiling of liquids for excess temperature ranging from 5 to 30 °C in various processes related to high vaporization of liquid for specific purposes like sugarcane juice heating for jaggery making, milk heating for khoa making, steam generation, cooling of electronic equipments, refrigeration and etcetera. In this review paper, pool boiling method during heating of liquids for specific purpose is depicted. It is inferred that enhancement in pool boiling heat transfer is a challenging and complex task. Also, recent research and use of various correlations for natural convection pool boiling is reviewed.

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“…The load temperature is estimated using the Rohsenow's boiling correlation of refrigerant R134a (18) . The current simulations are based on per unit mass of the adsorbent.…”

Section: Operation Processmentioning

confidence: 99%

Performance Analysis of Waste Heat Driven Pressurized Adsorption Chiller

Loh

Saha

Chakraborty

et al. 2010

JTST

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This article presents the transient modeling and performance of waste heat driven pressurized adsorption chillers for refrigeration at subzero applications. This innovative adsorption chiller employs pitch-based activated carbon of type Maxsorb III (adsorbent) with refrigerant R134a as the adsorbent-adsorbate pair. It consists of an evaporator, a condenser and two adsorber/desorber beds, and it utilizes a low-grade heat source to power the batch-operated cycle. The ranges of heat source temperatures are between 55 to 90 °C whilst the cooling water temperature needed to reject heat is at 30 °C. A parametric analysis is presented in the study where the effects of inlet temperature, adsorption/desorption cycle time and switching time on the system performance are reported in terms of cooling capacity and coefficient of performance.

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Evaluation of the rohsenow correlation through experimental pool boiling of halocarbon refrigerants on cylindrical surfaces

Cited by 49 publications

References 10 publications

An Overview of Surface Roughness Effects on Nucleate Boiling Heat Transfer~!2009-10-31~!2010-01-01~!2010-04-16~!

An Overview of Surface Roughness Effects on Nucleate Boiling Heat Transfer~!2009-10-31~!2010-01-01~!2010-04-16~!

Research progresses and future directions on pool boiling heat transfer

Performance Analysis of Waste Heat Driven Pressurized Adsorption Chiller

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