Multi-scale Control and Enhancement of Reactor Boiling Heat Flux by Reagents and Nanoparticles

Manglik, Raj M.; Athavale, Advait D.; Kalaikadal, Deepak S.; Deodhar, Anirudh M.; Verma, U.

doi:10.2172/1024386

Cited by 1 publication

(2 citation statements)

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“…At the micro-scale, and during nucleation and bubble growth, the transient transport mechanisms at the solid-liquid-vapor interface can be attributed to the thin-film spreading and the micro-layer evaporation. But the major effect occurs at the macro-scale where, the heat transport is governed by the bubble growth, distribution, and dynamics; (bubble translation, coalescence, collapse, and break-up) [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…With the nucleation of a vapor bubble and during its subsequent growth, the diffusion of surfactant molecules, and their adsorption rates at the interface govern the extent of dynamic surface tension. The relation between the amount of additive and the reduction in surface tension is not linear, but asymptotic [2][3]. Toshiaki et al [4] tested the surface tension for alcohol/water mixtures, and the alcohol mass fraction ranged from 0 to 1 and added Perfluoroalkyl to these mixtures at concentrations ranged from 0 to 5000 ppm.…”

Section: Introductionmentioning

confidence: 99%

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Relating the Bubble Density to the Heat Transfer in Pool Boiling Processes of Surfactant Solutions

Pasha¹

2019

IJHT

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During a pool boiling process, the bubble distribution plays an essential role in the heat transfer enhancement. In the present work, a controllable test rig was prepared to investigate the heat flux and superheat temperature in a nucleate pool boiling process. Aqueous solutions of three surfactants were tested on three heated tubes that are made of brass, aluminum, and stainless steel with almost the same surface roughness. The investigated surfactants are; TRITON X-100, SLES, and SDS, each one was tested at concentrations; 0, 100, 400, 700, 1000, 1300, 1600 and 1900 ppm. For each case, the measured superheat temperatures and their corresponding heat fluxes and physical properties of the surfactant solution are fed into suitable relations. Consequently, correlations could be deduced to relate the heat flux to the bubble distribution, the superheat temperature and the concentration of different surfactant solutions. The results showed that, for all cases, the density of bubble distribution increased with the superheat temperature, the heat flux, and the surfactant concentration. For TRITON-X, the bubble distribution increased considerably with the surfactant concentration until the range of values between 400 and 700 ppm, and beyond this range, this rate of increase started to decay.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%