Experimental Study of Contact Angle and Active Nuleation Site Distribution on Nanostructure Modified Copper Surface in Pool Boiling Heat Transfer Enhancement

Nolan, Eric; Rioux, Russell P.; Jiang, Pei-Xue; Peterson, G. P.; Li, Calvin Hong

doi:10.1615/heattransres.2012005687

Cited by 14 publications

(11 citation statements)

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“…1) to create different contact angles from that on a plain Cu surface, which enables to examine the magnitude of CHF enhancements due to the hydrodynamic instability wavelengths changed by contact angles. Equilibrium contact angles (measured when a droplet is not about to move), advancing contact angles (measured when a droplet is about to replace vapor/gas phase in front of it), and receding contact angles (measured when a droplet is about to give way to vapor/gas phase in front of it), are measured by a standard contact angle goniometer system2630 on a plain Cu surface, 200 nm, and 500 nm diameter spherical Cu nanocavity surfaces. The smooth plain Cu surface has an average equilibrium contact angle of 78.35° with a standard deviation of 1.13°.…”

Section: Resultsmentioning

confidence: 99%

“…The weakness of this model is the failure to take into consideration of heating surface effects on hydrodynamic instability. Recent pool boiling studies on micro/nanoscale surface structures2324252627282930 have led to the latest modifications of the hydrodynamic instability model with heating surface effects, including the contact angles1415, surface wettability, and capillary wicking1617. On the other hand, the study of hydrodynamic instability models on porous structures has been pursued, too, which focuses on controlling hydrodynamic instability wavelength by the characteristic length of porous structures of micron and millimeter scales263132.…”

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confidence: 99%

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Independent and collective roles of surface structures at different length scales on pool boiling heat transfer

Rioux

2016

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Spherical Cu nanocavity surfaces are synthesized to examine the individual role of contact angles in connecting lateral Rayleigh-Taylor wavelength to vertical Kevin-Helmholtz wavelength on hydrodynamic instability for the onset of pool boiling Critical Heat Flux (CHF). Solid and porous Cu pillar surfaces are sintered to investigate the individual role of pillar structure pitch at millimeter scale, named as module wavelength, on hydrodynamic instability at CHF. Last, spherical Cu nanocavities are coated on the porous Cu pillars to create a multiscale Cu structure, which is studied to examine the collective role and relative significance of contact angles and module wavelength on hydrodynamic instability at CHF, and the results indicate that module wavelength plays the dominant role on hydrodynamic instability at CHF when the height of surface structures is equal or above ¼ Kelvin-Helmholtz wavelength. Pool boiling Heat Transfer Coefficient (HTC) enhancements on spherical Cu nanocavity surfaces, solid and porous Cu pillar surfaces, and the integrated multiscale structure have been investigated, too. The experimental results reveal that the nanostructures and porous pillar structures can be combined together to achieve even higher enhancement of HTC than that of individual structures.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Independent and collective roles of surface structures at different length scales on pool boiling heat transfer

Rioux

2016

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“…Different from the dendritic crystals which were prepared without the presence of assisted templates, particle aggregates and clusters were synthesized under the existence of PAM and AM templates, respectively ( Fig. 59,60 The energy variation on the surface of the Ag 2 MoO 4 grains enabled active sites to be produced which became the new growth centre to form the new nuclei. The reason for the agglomeration of products in Fig.…”

Section: 42mentioning

confidence: 99%

Thermal perturbation nucleation and growth of silver molybdate nanoclusters by a dynamic template route

et al. 2015

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Silver molybdate ĲAg 2 MoO 4 ) nanoclusters were first prepared by a dynamic template route under 20°C.The heat released from the polymerization of the acrylamide (AM) assisted templates induced high active sites to be generated on the surface of the crystal where more attracted nuclei were adsorbed on. The continuously formed nuclei assembled together and the nanoclusters were formed. The paper provided an explanation for the formation of the Ag 2 MoO 4 nanoclusters through the research on reaction conditions; on the other hand, the comparison of photocatalytic performance and antibacterial properties between the Ag 2 MoO 4 nanoclusters and the Ag 2 MoO 4 crystals of other morphologies showed that the Ag 2 MoO 4 nanoclusters had better photocatalytic and antibacterial activities, which was a preliminary perspective for the application of the nanocluster materials.CrystEngComm, 2015, 17, 5511-5521 | 5511This journal is

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“…θ m is considered because of the bubbles moving from hydrophilic to hydrophobic regions. Constant c can be determined by evaluating CA and active nucleation site distribution, 15 where c = 0.322. Where θ M of a hydrophobic region is fixed (θ M = 105…”

Section: Ca113mentioning

confidence: 99%

Reversed boiling curve phenomenon on surfaces with interlaced wettability

et al. 2014

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We experimentally investigated the effects of contact angle difference of heterogeneous wettability surfaces on pool boiling. For surfaces exhibiting heterogeneous wettability, this study determined that the pool boiling curve experiences a superheat decrease in some regions before the system achieves the critical heat flux. In addition, oscillation of the vapor column and bubble transverse motions on the heterogeneous wettability coated surface were observed.

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Experimental Study of Contact Angle and Active Nuleation Site Distribution on Nanostructure Modified Copper Surface in Pool Boiling Heat Transfer Enhancement

Cited by 14 publications

References 0 publications

Independent and collective roles of surface structures at different length scales on pool boiling heat transfer

Independent and collective roles of surface structures at different length scales on pool boiling heat transfer

Thermal perturbation nucleation and growth of silver molybdate nanoclusters by a dynamic template route

Reversed boiling curve phenomenon on surfaces with interlaced wettability

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