Enhancement of pool-boiling heat transfer using nanostructured surfaces on aluminum and copper

Hendricks, Terry J.; Krishnan, Shankar; Choi, Chang-Ho; Chang, Chia‐Chin; Paul, Brian K.

doi:10.1016/j.ijheatmasstransfer.2010.02.025

Cited by 173 publications

(62 citation statements)

References 34 publications

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“…6) with maximum feature sizes of about 100 lm. 2 With the use of highly conductive copper and aluminum surfaces, functionalization is typically achieved with chemical etching processes or deposition techniques which result in maximum feature sizes of only a few microns, [9][10][11][12][13][14][15][16][17][18] and a moderate increase in critical heat flux and heat transfer coefficient. However, limited research on surface functionalization has been conducted on lower thermal conductivity metallic materials.…”

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confidence: 99%

Secondary pool boiling effects

Kruse

Tsubaki

Zuhlke

et al. 2016

Applied Physics Letters

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A pool boiling phenomenon referred to as secondary boiling effects is discussed. Based on the experimental trends, a mechanism is proposed that identifies the parameters that lead to this phenomenon. Secondary boiling effects refer to a distinct decrease in the wall superheat temperature near the critical heat flux due to a significant increase in the heat transfer coefficient. Recent pool boiling heat transfer experiments using femtosecond laser processed Inconel, stainless steel, and copper multiscale surfaces consistently displayed secondary boiling effects, which were found to be a result of both temperature drop along the microstructures and nucleation characteristic length scales. The temperature drop is a function of microstructure height and thermal conductivity. An increased microstructure height and a decreased thermal conductivity result in a significant temperature drop along the microstructures. This temperature drop becomes more pronounced at higher heat fluxes and along with the right nucleation characteristic length scales results in a change of the boiling dynamics. Nucleation spreads from the bottom of the microstructure valleys to the top of the microstructures, resulting in a decreased surface superheat with an increasing heat flux. This decrease in the wall superheat at higher heat fluxes is reflected by a “hook back” of the traditional boiling curve and is thus referred to as secondary boiling effects. In addition, a boiling hysteresis during increasing and decreasing heat flux develops due to the secondary boiling effects. This hysteresis further validates the existence of secondary boiling effects.

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confidence: 99%

Secondary pool boiling effects

Kruse

Tsubaki

Zuhlke

et al. 2016

Applied Physics Letters

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“…It is reported that the presence of this layer alters the surface wettability and roughness and number of nucleation site present on the surface [29][30][31][32][33][34][35][36][37]. The reduction in evaporator wall temperature for decreasing heat flux at heat pipe with 5 wt.% of NF compared with other cases may be attributed to the effect of NFs on vapor bubble formation by bombarding the vapor bubbles by nanoparticles during their formation [38], the increase of active nucleation site density and bubble departure frequency [28,[39][40][41]. In fact, the problem of blocking the liquid to be supplied to the entire evaporator surface at higher heat fluxes may be eliminated by bombarding the vapor bubbles during their formation with nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Thermal performance of screen mesh heat pipe with Al2O3 nanofluid

Ghanbarpour

Nikkam

Khodabandeh

et al. 2015

Experimental Thermal and Fluid Science

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a b s t r a c tThis study presents the effect of Al 2 O 3 nanofluid (NF) on thermal performance of screen mesh heat pipe in cooling applications. Three cylindrical copper heat pipes of 200 mm length and 6.35 mm outer diameter containing two layers of screen mesh were fabricated and tested with distilled water and water based Al 2 O 3 NF with mass concentrations of 5% and 10% as working fluids. To study the effect of NF on the heat pipes thermal performance, the heat input is increased and then decreased consecutively and the heat pipes surface temperatures are measured at steady state conditions. Results show that using 5 wt.% of Al 2 O 3 NF improves the thermal performance of the heat pipe for increasing and decreasing heat fluxes compared with distilled water, while utilizing 10 wt.% of Al 2 O 3 NF deteriorates the heat pipe thermal performance. For heat pipe with 5 wt.% Al 2 O 3 NF the reduction in thermal resistance of the heat pipe is found to be between 6% and 24% for increasing and between 20% and 55% for decreasing heat fluxes, while the thermal resistance increased between 187% and 206% for increasing and between 155% and 175% for decreasing steps in heat pipe with 10 wt.% of Al 2 O 3 NF.

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“…Solids have thermal conductivities that are orders of magnitude larger than those of traditional heat transfer fluids. Small solid particles (nanoparticles) of high thermal conductivity with size below 100 nm can suspend in aqueous solutions of surfactants or solvents without damaging the structure of heat transfer systems [32] (i.e., there is no abrasion or clogging). Colloidal suspensions have shown intriguing thermal performances,particularly regarding the following four points: (1) increased thermal conductivity (~150%);(2) increased single-phase heat transfer coefficient (~60%);(3) increased critical heat flux with extended nucleate boiling regime (~200%);and (4) improved quenching efficiency.…”

Section: Fluid-modification Technology (Nanofluid Technology)mentioning

confidence: 99%