The effect of droplet morphology on the heat transfer performance of micro-/nanostructured surfaces in dropwise condensation

Bahrami, Hamid Reza Talesh; Zarei, Saeed; Saffari, Hamid

doi:10.1007/s10973-019-08318-1

Cited by 9 publications

(5 citation statements)

References 34 publications

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“…This shows that in the presence of non-condensable gases, the heat transfer performance of superhydrophobic and hydrophilic surfaces is not reduced by the wall thermal resistance caused by the condensate trapped between the microstructures. But due to the microstructures on the surface, the surface of the cylindrical microstructure is much larger than the surface of the frustum microstructure [11] , so the heat dissipation performance of the surface of the cylindrical microstructure is better than that of the surface of the frustum microstructure. When the cooling water flow rate G=500.7 g/min, the maximum heat flux on the cylindrical surface is 380.13 kW/m 2 , while the maximum heat flux on the truncated surface is only 173.29 kW/m 2 ; when the cooling water flow rate G=603.95 g/min, the maximum heat flux on the cylindrical surface is 458.44 kW/m 2 , while the maximum heat flux on the truncated surface is only 208.99 kW/m 2 .…”

Section: Stability Analysis Of Experimental Systemmentioning

confidence: 99%

Experimental Study on Condensation Heat Transfer Performance of Hydrophilic/Hydrophobic Microstructured

He,

Wen,

Wang

et al. 2023

J. Phys.: Conf. Ser.

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In order to study the condensation and heat transfer characteristics of similar microstructure surfaces, two similar microstructure surfaces, cylindrical and circular, were fabricated by femtosecond laser technology on a 0.5 mm silicon wafer. The cylindrical surface is superhydrophobic when the contact angle is more than 150°, and the circular surface is hydrophilic when the contact angle is less than 90°. The difference in condensation heat transfer characteristics between superhydrophobic and hydrophilic microstructures was analyzed, and a visual condensation experimental platform was built. Experimental research showed that: At the same flow rate, the heat transfer coefficient of the superhydrophobic surface and the hydrophilic surface decreases significantly with the increase of the surface subcooling degree, but the heat transfer coefficient of the cylindrical surface is still much larger than that of the circular surface. In addition, the heat transfer performance of the hydrophobic microstructure surface is better than that of the hydrophilic surface at medium and high-speed cooling water flow rates. Although the surface microstructures are similar in shape, the heat transfer performance of cylindrical microstructures is much better than that of circular microstructures under the same conditions, and the heat flux of cylindrical microstructures is 2.2 times that of circular microstructures.

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Section: Stability Analysis Of Experimental Systemmentioning

confidence: 99%

Experimental Study on Condensation Heat Transfer Performance of Hydrophilic/Hydrophobic Microstructured

He,

Wen,

Wang

et al. 2023

J. Phys.: Conf. Ser.

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“…As mentioned before, for Marangoni numbers higher than 2204, Marangoni convection can play a significant role in the droplet heat transfer characteristics. 19 The minimum droplet radius in which the Marangoni convection effect is significant can be computed using equation (11).…”

Section: Single Droplet Heat Transfer On a Microstructured Superhydro...mentioning

confidence: 99%

“…TaleshBahrami et al 11 researched droplet morphology on microstructured surfaces. In their numerical model framework, The Cassie–Baxter and Wenzel models were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…However, some analytical research has also shown that the smooth dropwise surface will have better heat transfer characteristics than that of the Wenzel and Cassie–Baxter surfaces. 11,21…”

Section: Introductionmentioning

confidence: 99%

“…However, some analytical research has also shown that the smooth dropwise surface will have better heat transfer characteristics than that of the Wenzel and Cassie-Baxter surfaces. 11,21 Although DWC and hybrid hydrophobic-hydrophilic surfaces are major areas of interest in heat transfer, little research has been conducted on the impact of the Marangoni convection on dropwise heat transfer, exclusively when micro/nanostructures have been implemented on the dropwise region. Investigations were primarily experimental and were carried out to study and simulate an individual and single droplet, little research has been carried out to investigate the impact of Marangoni convection on hybrid hydrophobic-hydrophilic surfaces.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical analysis on condensation heat transfer on the hydrophobic–hydrophilic hybrid surfaces with the impact of the Marangoni convection

Vatanjoo

Aminian

Kamali

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Condensation occurs in the forms of filmwise condensation and dropwise condensation. Over the past decade, hybrid hydrophobic–hydrophilic surfaces have received significant attention due to their potential to enhance the heat transfer rate compared to complete dropwise condensation. The maximum condensed droplet radius in the hydrophobic region has a considerable impact on the heat transfer characteristics. This paper discusses the effect of the maximum droplet radius on hybrid surface heat transfer characteristics. On top of that, Marangoni convection effects originated due to the temperature gradient as a heat transfer resistance on the heat transfer rate is considered, modelled and investigated. Three models were investigated in this paper. The results indicate that there is an optimum maximum droplet radius for each model that can improve the heat transfer rate. When the filmwise region width increases from 0.5 mm to 1.0 mm, the optimum maximum droplet radius increases from 0.25 mm to 0.3 mm. For a fixated droplet contact angle and filmwise and dropwise region widths, the hybrid heat flux of the smooth dropwise model can be up to 1.55 times higher than that of the Cassie–Baxter model, and the hybrid heat flux of the smooth dropwise model can be up to 1.38 time higher than that of the Wenzel state. Finally, considering Marangoni convection showed up to a 30% increase in the heat transfer coefficient in some cases.

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Research on variation in nanopore parameters and surface characteristics of anodic aluminum oxide (AAO) films with time-controlled anodization processes

Kim,

Jeong

2024

J Mater Sci

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The effect of droplet morphology on the heat transfer performance of micro-/nanostructured surfaces in dropwise condensation

Cited by 9 publications

References 34 publications

Experimental Study on Condensation Heat Transfer Performance of Hydrophilic/Hydrophobic Microstructured

Experimental Study on Condensation Heat Transfer Performance of Hydrophilic/Hydrophobic Microstructured

Theoretical analysis on condensation heat transfer on the hydrophobic–hydrophilic hybrid surfaces with the impact of the Marangoni convection

Research on variation in nanopore parameters and surface characteristics of anodic aluminum oxide (AAO) films with time-controlled anodization processes

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