Enhancement of nucleate boiling heat transfer using structured surfaces

Nirgude, Vishal V.; Sahu, Santosh Kumar

doi:10.1016/j.cep.2017.10.013

Cited by 38 publications

(3 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The preparation methods for these porous structures primarily involve machining (wire cutting, CNC machining, MEMS, etc.) [2][3][4][5], sintering [6][7][8], electrochemical methods (vapor deposition, electrochemical deposition, anodic oxidation, etc.) [9][10][11], laser processing [12,13], etc.…”

Section: Introductionmentioning

confidence: 99%

Study on Boiling Heat Transfer Characteristics of Composite Porous Structure Fabricated by Selective Laser Melting

Liu,

Gu,

Liang

2023

Materials

View full text Add to dashboard Cite

Surface porosity is an important means of enhancing boiling heat transfer. In this paper, two kinds of composite porous structures of surface micropore + square channel and framework micropore + square channel were prepared by selective laser melting technology using AlSi10Mg as the powder material. The effect of composites with different pore forms on boiling heat transfer was investigated in pool boiling experiments. It was found that controlling the thickness of the powder layer manufactured by selective laser melting can change the surface roughness of the sample, and the sandblasting treatment reduced the surface roughness of the samples. The average heat transfer coefficient of the rough surface composite porous structure sample was increased by 40% compared to the sandblasted sample. The micropores on the surface of the sample and inside the framework significantly enhanced the heat transfer coefficient of the composite porous structure. The presence of surface micropores increased the heat transfer area and the vaporization core density of the composite porous structure and exhibited excellent heat transfer coefficient improvement in the low heat flux region. The framework microporous composite porous structure can form effective gas–liquid diversion at high heat flux and obtain higher heat transfer performance. The large channel in the composite porous structure is the key control factor of the critical heat flux.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on Boiling Heat Transfer Characteristics of Composite Porous Structure Fabricated by Selective Laser Melting

Liu,

Gu,

Liang

2023

Materials

View full text Add to dashboard Cite

show abstract

“…Rainey and You [9] obtained experimental results for plain and square pin finned surfaces; it was reported that the pin fins create resistance to the vapor bubbles departure and increase the flow resistance that can lead to a local dryout condition. Nirgude and Sahu [10] investigated the nucleate boiling heat transfer performance of various orthogonally intersecting tunnel structured surfaces using water and isopropyl alcohol as working fluids. The experimental study revealed that the tunnel structure enhances the liquid transport network that improves the activation of nucleation sites, improving the liquid-vapor interaction and delaying the dryout.…”

Section: Introductionmentioning

confidence: 99%

Effect of microfin surfaces on boiling heat transfer using HFE-7100 as working fluid

Kiyomura

Nunes

Souza

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

One promising way to enhance the heat transfer coefficient (HTC) and the critical heat flux (CHF) is modifying the heating surface morphology by using machining techniques, coating, and chemical processes. Microstructured surfaces, i.e., surfaces with the presence of micropillars on the surface, provide small perturbations in the liquid, affecting the vapor bubbles dynamic. These structures increase the heating surface area and change the fluid flow. Microfins can have different shapes and sizes and can be arranged in different patterns to improve heat transfer. This study aims to evaluate experimentally the thermal performance of different microfin surfaces by using HFE-7100 as working fluid. Square micro-pillar arrays were etched on a plain copper surface through the micro-milling process. Square microfins of different length scales (i.e., height and side length) were uniformly spaced on the plain copper surface. The inter-fin space had the same value, 250 μm, for all surfaces in order to control the effective roughness, R eff , defined as the ratio of the area in contact with the liquid to the projected area. Microfin surfaces intensify the HTC as compared to plain surfaces and the number of fins is the main factor for the HTC enhancement; if the number of microfins is constant, the larger the effective roughness, the higher the heat transfer performance. Additionally, the capillary-wicking ability increases and it also improves the HTC and the dryout heat flux due to the prevention of hotspots in the microfin surface. Thus, the surface thermal behavior is a function of the surface morphology and its surface capillary wicking.

show abstract

“…They attributed low flux enhancement to Bond Number (ratio of gravitational to surface tension forces) and found that the enhancement is insensitive to channel aspect ratio. Vishal et al [3] created square-pillar structures using wire EDM and found a 250% enhancement in boiling heat transfer for water and 100% enhancement for isopropyl alcohol as compared to a polished surface. Although EDM has been used to produce surfaces with enhanced boiling heat transfer performance, however, no study reported the boiling enhancement in terms of EDM machining parameters.…”

Section: Introductionmentioning

confidence: 99%

Boiling Heat Transfer Enhancement Using Engineered Surfaces

Dhadda¹,

Hamed²,

Koshy³

2019

Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering

View full text Add to dashboard Cite

The widespread use of boiling heat transfer in various applications is due to high heat transfer coefficients associated with the phase change from liquid to vapor. Boiling heat transfer coefficients can be further enhanced by modifying the surface conditions of the heated surface at which boiling occurs. The objective of this research is to fabricate textured surfaces with electrical discharge machining (EDM) and to investigate the enhancement in pool boiling heat transfer, concerning machining parameters. It was found that the boiling performance of the surface correlates with the EDM machining parameters with a significant enhancement in heat transfer.

show abstract

Enhancement of nucleate boiling heat transfer using structured surfaces

Cited by 38 publications

References 37 publications

Study on Boiling Heat Transfer Characteristics of Composite Porous Structure Fabricated by Selective Laser Melting

Study on Boiling Heat Transfer Characteristics of Composite Porous Structure Fabricated by Selective Laser Melting

Effect of microfin surfaces on boiling heat transfer using HFE-7100 as working fluid

Boiling Heat Transfer Enhancement Using Engineered Surfaces

Contact Info

Product

Resources

About