Pool boiling heat transfer enhancement with segmented finned microchannels structured surface

Gouda, Rinku Kumar; Pathak, Manabendra; Khan, Mohd. Kaleem

doi:10.1016/j.ijheatmasstransfer.2018.06.115

Cited by 105 publications

(15 citation statements)

References 27 publications

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“…The achievement of high critical heat flux at low wall superheat provides better life of multiphase heat transfer equipment. Gouda et al [1] compared the heat transfer performance of segmented fin configuration in micro-channels with bare substrates and micro-channel with uniform crosssection. The results showed that the enhancement in heat transfer achieved significantly for segmented fin configuration substrates due to better wetting over the substrate.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of critical heat flux on SiO2 thin film deposited copper substrate in DI water at atmospheric pressure

Nithyanandam¹,

Kumar²

2020

THERM SCI

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High heat flux at low excess temperature is the prime factor in pool boiling heat transfer. One of the methods to enhance peak heat flux in nucleate boiling is surface modification. The substrate of the copper has been modified by SiO2 thin film coating. The coating was performed on the substrate at three different thicknesses 250 nm, 500 nm, and 750 nm. The thin film coating was done by sputtering technique. The water contact angle was measured for bare and SiO2 thin film coated substrates. The contact angle decreased drastically because of more nucleation sites involved for wetting the substrate. The coating characteristics reported that the wettability of the copper substrate plays an important role in the critical heat flux enhancement. The critical heat flux test was carried out for bare copper substrate and SiO2 thin film coated copper substrates. The SiO2 thin film coating exhibited superhydrophillic nature on the substrate because of greater wettability. The superhydrophillic nature of the substrate enhanced the peak heat flux significantly. Also the boiling heat transfer coefficient was improved at high heat flux in nucleate boiling regime.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of critical heat flux on SiO2 thin film deposited copper substrate in DI water at atmospheric pressure

Nithyanandam¹,

Kumar²

2020

THERM SCI

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“…According to their observation, rougher surface means more cavities and larger active nucleation site density during the boiling process. Therefore, different advanced fabrication techniques, such as Electrical Discharge Machining, 9 Micro Milling, 10 and deposition, 11 have been used to modify the surface structure in boiling applications to improve the boiling heat transfer coefficient 12 and increase critical heat flux 13 of nucleate boiling. Aside from surface roughness of the solid heater, the density of the active nucleation site is also associated with the local temperatures at the nucleation sites of the boiling surface.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the activation of nucleation sites and bubble interactions in twin-bubble nucleate boiling

Pan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present study aims to investigate the interplay between the activation behavior of neighboring nucleation sites and the corresponding bubble dynamics in twin-bubble nucleate boiling. For this purpose, boiling of water on a copper heater with two nucleation sites is simulated by using a thermal-hydrodynamic coupling method. This method treats active nucleation sites as vapor sources, and the vapor generation rates from the nucleation sites are incorporated into the two-phase flow simulation as the inlet boundary conditions at the corresponding sites, which are computed via a dynamic model of microlayer evaporation. Various sizes and arrays of cavities are considered to investigate the activation timing of the nucleation sites, temperature fluctuations of the heated surface, and dynamics of the two bubbles. The simulated results show that the hydrodynamic interaction between the adjacent bubbles can cause the alternative activation of the nucleation sites and lead to irregular fluctuations to the temperature of the heated surface. The difference of the critical activation superheats between the neighboring nucleation sites can induce intermittent activation of the nucleation sites accompanied with a waiting time of the activation for the smaller-size cavity. The smaller the cavity is, the longer the waiting time of the activation becomes. The two bubbles growing from different nucleation sites are observed to approach each other, which stem from the wake flow left by the neighboring rising bubbles.

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“…During the last decades, many efforts have been made to experimentally study the pool boiling heat transfer performance with various working fluids involving pure liquids [4,5], refrigerants [6,7], and mixtures liquids [8][9][10]. Other studies have been conducted by surface heating modifications to enhance the pool boiling heat transfer performance [11][12][13][14]. One of the alternative ways to improve the thermal conductivity of the working fluid is to use nanofluids, which were introduced in 1995 by Choi and his team [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Pool Boiling Heat Transfer Performance Using Tungsten Oxide WO3 Nanomaterial-Based Water Nanofluids

Kamel

Lezsovits

2020

Materials

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This study aims to experimentally investigate the pool boiling heat transfer coefficient behavior using tungsten oxide-based deionized water nanofluids and comparing them to deionized water as conventional fluid. The influence of different dilute volumetric concentrations (0.005%–0.05% Vol.) and applied heat fluxes were examined to see the effect of these parameters on the pool boiling heat transfer performance using nanofluids from a typical horizontal heated copper tube at atmospheric pressure conditions. Results demonstrated that the pool boiling heat transfer coefficient (PBHTC) for both deionized water and nanofluids increased with increasing the applied heat flux. The higher PBHTC enhancement ratio was 6.7% for a volume concentration of 0.01% Vol. at a low heat flux compared to the deionized water case. Moreover, the PBHTC for nanofluids was degraded compared to the deionized water case, and the maximum reduction ratio was about 15% for a volume concentration of 0.05% Vol. relative to the baseline case. The reduction in PBHTC was attributed to the deposition of tungsten oxide nanoflakes on the heating surface during the boiling process, which led to a decrease in the density of the nucleation sites.

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Pool boiling heat transfer enhancement with segmented finned microchannels structured surface

Cited by 105 publications

References 27 publications

Experimental investigation of critical heat flux on SiO2 thin film deposited copper substrate in DI water at atmospheric pressure

Experimental investigation of critical heat flux on SiO2 thin film deposited copper substrate in DI water at atmospheric pressure

Numerical study on the activation of nucleation sites and bubble interactions in twin-bubble nucleate boiling

Experimental Investigation on Pool Boiling Heat Transfer Performance Using Tungsten Oxide WO3 Nanomaterial-Based Water Nanofluids

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