Enhancement of Heat Transfer in Subcooled Pool Boiling by Nano-textured Surface

Improving the performance of pool boiling with critical heat flux of pool boiling and enhancing the coefficient of heat transfer through surface modification technique have gained a lot of attention. These surface modifications can be done at different scales using various techniques. However, along with the performance improvement, the durability and stability of the surface modification are very crucial. Laser machining is an attractive option in this aspect and is gaining a lot of attention. In the present experimentation research work, pool boiling attributed performance of copper-grooved surfaces obtained through picosecond laser machining method is investigated. The performance of the modified surfaces was compared with the plain surface serving as reference. In this, three square grooved patterns with the same pitch (100 μm) and width (100 μm) but different depths (30, 70, and 100 μm) were investigated. Different depths were obtained by varying the scanning speed of the laser machine. In addition to the microchannel effect, the grain structuring during the laser machining process creates additional nucleation sites which has proven its effectiveness in improving the pool boiling performance. In all aspects, the pool boiling performance of the grooved laser-textured surface has showed increased surface characterisation as compared with the surface of copper.

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Structured capillary-porous coatings for enhancement of heat transfer at pool boiling

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2018.01.051 ◽

2018 ◽

Vol 133 ◽

pp. 532-542 ◽

Cited By ~ 24

Author(s):

Anton Surtaev ◽

Denis Kuznetsov ◽

Vladimir Serdyukov ◽

Aleksandr Pavlenko ◽

Vasiliy Kalita ◽

...

Keyword(s):

Heat Transfer ◽

Pool Boiling ◽

Enhancement Of Heat Transfer ◽

Porous Coatings

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Comparison of heat transfer coefficients of open micro-channels and plain micro-fins

EPJ Web of Conferences ◽

10.1051/epjconf/201818002041 ◽

2018 ◽

Vol 180 ◽

pp. 02041 ◽

Cited By ~ 6

Author(s):

Robert Kaniowski ◽

Robert Pastuszko

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Transfer Coefficient ◽

Pool Boiling ◽

Transfer Coefficients ◽

Base Surface ◽

Enhancement Of Heat Transfer ◽

Heat Transfer Coefficients ◽

Micro Channels ◽

Open Microchannel

The paper describes results of analysis of pool boiling heat transfer on enhanced surfaces. Two types of structural surfaces were used: open microchannel surfaces consisting of a system of parallel micro-channels 0.3 mm wide, from 0.2 to 0.5 mm deep and with a pitch of 0.6 mm, and plain micro-fins 0.5 mm in height, uniformly spaced on the base surface with a spacing from 0.6 to1.5 mm. Pool boiling data at atmospheric pressure were obtained for saturated water, ethanol and FC-72. The effects of micro-channel/micro-fin dimensions on heat transfer coefficient in nucleate pool boiling were examined. Substantial enhancement of heat transfer coefficient was observed.

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Enhancement in pool boiling heat transfer of ethanol and nanofluid on novel supersonic nanoblown nanofiber textured surface

Experimental Heat Transfer ◽

10.1080/08916152.2021.1919243 ◽

2021 ◽

pp. 1-17

Author(s):

Satyam Singh Thakur ◽

Sheshang Singh Chandel ◽

Ashish Kakoria ◽

Sumit Sinha-Ray

Keyword(s):

Heat Transfer ◽

Boiling Heat Transfer ◽

Pool Boiling ◽

Textured Surface ◽

Pool Boiling Heat Transfer

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Enhancement of heat transfer at pool boiling on surfaces with silicon oxide nanowires

Journal of Physics Conference Series ◽

10.1088/1742-6596/925/1/012033 ◽

2017 ◽

Vol 925 ◽

pp. 012033

Author(s):

E A Chinnov ◽

E N Shatskiy ◽

S Ya Khmel ◽

E A Baranov ◽

A O Zamchiy ◽

...

Keyword(s):

Heat Transfer ◽

Silicon Oxide ◽

Pool Boiling ◽

Enhancement Of Heat Transfer ◽

Oxide Nanowires

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Effect of Nanofluids on the Enhancement of Boiling Heat Transfer: A Review

International Journal of Engineering Materials and Manufacture ◽

10.26776/ijemm.06.04.2021.03 ◽

2021 ◽

Vol 6 (4) ◽

pp. 259-283

Author(s):

Md. Osman Ali ◽

Mohammad Zoynal Abedin ◽

Md. Dulal Ali ◽

Mohammad Rasel Rasel

Keyword(s):

Heat Transfer ◽

Heat Flux ◽

Critical Heat Flux ◽

Boiling Heat Transfer ◽

Flow Boiling ◽

Pool Boiling ◽

Working Fluid ◽

Two Phase ◽

Enhancement Of Heat Transfer ◽

Passive Techniques

Boiling heat transfer can play a vital role in the two-phase flow applications. The analysis of the boiling hat transfer enhancement is of importance in such applications and the enhancement can be mostly conducted by using various active and passive techniques. One type of passive techniques is the enhancement of heat transfer by nanofluids. This article presents an extensive review on the effect of different nanofluids on the enhancement of heat transfer coefficient (HTC) and critical heat flux (CHF) for both pool as well as flow boiling. Nanoparticles addition to a working fluid is done arbitrarily to improve the thermophysical properties which in turn improves heat transfer rate. Numerous works have been done in the studies on nanofluid boiling. Among various nanoparticles, the most frequently used nanoparticles are Al2O3 and TiO2. In the case of binary nanoparticles, the most commonly used combination is Al2O3 and TiO2. After reviewing the relevant literatures, it is found that for pool boiling, the maximum HTC is increased to 138% for TiO2 nanoparticles and the maximum CHF is increased to 274.2% for MWCNTs. Conversely, in flow boiling the maximum HTC is increased to 126% for ZnO nanoparticles and the maximum CHF increased to as 100% for GO nanoparticles. In addition, when two or more nanoparticles in succession or binary nanofluids are used the CHF in pool boiling increased up to 100% for Al2O3 and TiO2 as well as the CHF in flow boiling increased up to 100% for Al2O3, ZnO, and Diamond. Though the information of the coefficient of heat transfer and the critical heat flux varied for different nanofluids and vary from experiment to experiment for each of the nanofluids. This variation happens because the coefficient of heat transfer and the critical heat flux in boiling is dependent upon several factors.

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