Boiling is an efficient heat transfer process that enables significant heat transfer at low driving temperatures. A key indicator of reduced boiling efficiency is the adhesion of nano-thin-film-coated interfaces to the base substrate. However, the mechanics underlying boiling on nano-thin-film surfaces remain insufficiently understood. This study presents an effective spin-coating and annealing method for fabricating zinc oxide (ZnO) nano-thin-film layers on bare copper substrates. ZnO, a conductive material with high surface energy, is commonly used in thin-film conductors. The fabricated substrates are evaluated through pool boiling experiments to determine their heat transfer performance. Before testing, surface characteristics, including roughness, porosity, pore diameter, contact angle, and coating thickness, are assessed. The ZnO coating layer with a thickness of 423 nm is engineered to enhance surface performance. Owing to the robust adhesion among the metal substrate and the ZnO nano film, the 423 nm coated surface demonstrates superior boiling behavior. All fabricated surfaces exhibit increased heat transfer coefficient (HTC) and critical heat flux (CHF) compared to bare copper. Notably, the ZnO-TF-423 surface achieves a 112.5% improvement in CHF and a 310% enhancement in HTC relative to the uncoated (bare) surface. The enhanced surface properties of the fabricated ZnO thin film suggest its potential application in microelectronics cooling devices.
PrakashCJPrasanthR. Enhanced boiling heat transfer by nanostructured surfaces and nanofluids. Renew Sustain Energ Rev2018; 82: 4028–4043.
2.
ChuHYuXJiangH, et al. Progress in enhanced pool boiling heat transfer on macro- and micro-structured surfaces. Int J Heat Mass Transf2023; 200: 123530.
3.
KumarNGhoshPShuklaP. Effect of composite coatings on surface characteristics and boiling heat transfer performance in a pool of water. J Therm Anal Calorim2024; 149: 671–685.
4.
MehdikhaniAMoghadasiHSaffariH. An experimental investigation of pool boiling augmentation using four-step electrodeposited micro/nanostructured porous surface in distilled water. Int J Mech Sci2020; 187: 105924.
5.
DebSDasMDasDC, et al. Significance of surface modification on nucleate pool boiling heat transfer characteristics of refrigerant R-141b. Int J Heat Mass Transf2021; 170: 120994.
6.
GuptaSKMisraRD. Effect of dense packed micro-/nano-porous thin film surfaces developed by a combined method of etching, electrochemical deposition and sintering on pool boiling heat transfer performance. Heat Mass Transf2024; 60: 281–303.
7.
GharraeiRDamiriSMahmoudiM, et al. An experimental study on the enhancement of nucleate boiling heat transfer using modified surfaces. Heat Mass Transf2022; 58: 1925–1936.
8.
GuptaSKMisraRD. Experimental pool boiling heat transfer analysis through novel zno-coated Cu (Cu@ZnO nanoparticle) hybrid nanofluid boiling on the fin tops of different microchannels. J Therm Anal Calorim2023; 148: 12247–12267.
9.
KiyomuraISManettiLLda CunhaAP, et al. An analysis of the effects of nanoparticles deposition on characteristics of the heating surface and on pool boiling of water. Int J Heat Mass Transf2017; 106: 666–674.
10.
BharadwajAMisraRD. Study of pool boiling on hydrophilic surfaces developed using electric discharge coating technique. Appl Therm Eng2023; 234: 121267.
11.
XuZGQinJ. Pool boiling investigation on gradient metal foams with double layers. Appl Therm Eng2018; 131: 595–606.
12.
GuptaSKMisraRD. Flow boiling heat transfer performance of copper-alumina micro-nanostructured surfaces developed by forced convection electrodeposition technique. Chem Eng Process Process Intensification2021; 164: 108408.
13.
LiCPetersonGP. Geometric effects on critical heat flux on horizontal microporous coatings. J Thermophys Heat Transf2010; 24(3): 449–455.
14.
SlomskiEMFischerSScheererH, et al. Textured CrN thin coatings enhancing heat transfer in nucleate boiling processes. Surf Coat Technol2013; 215: 465–471.
15.
UjerehSFisherTMudawarI. Effects of carbon nanotube arrays on nucleate pool boiling. Int J Heat Mass Transf2007; 50(19–20): 4023–4038.
16.
GuptaSKMisraRD. Experimental pool boiling heat transfer analysis with copper–alumina micro/nanostructured surfaces developed by a novel electrochemical deposition technique. Int J Thermophys2023; 44(7): 112.
17.
KumarNUrkudeNSonawaneSS, et al. Experimental study on pool boiling and critical heat flux enhancement of metal oxides based nanofluid. Int Commun Heat Mass Transf2018; 96: 37–42.
18.
AbdollahiAReza SalimpourM. Experimental investigation on the boiling heat transfer of nanofluids on a flat plate in the presence of a magnetic field. Eur Phys J Plus2016; 131: 1–16.
19.
RostamiSRakiEAbdollahiA, et al. Effects of different magnetic fields on the boiling heat transfer coefficient of the nio/deionized water nanofluid, an experimental investigation. Powder Technol2020; 376: 398–409.
20.
JonesBJMcHaleJPGarimellaSV. The influence of surface roughness on nucleate pool boiling heat transfer. J Heat Transf2009; 131: 1–14.
21.
GuptaSK. Experimental subcooled flow boiling instability and heat transfer analysis through zinc oxide coated copper hybrid nanofluid boiling on the structured microchannels. Chem Eng Process Process Intensification2024; 197: 109691.
MajewskiMQiuSRonsinO, et al. Simulation of perovskite thin layer crystallization with varying evaporation rates. Mater Horiz2025; 12(2): 555–564.
24.
LeeTSanzogniAVBurnPL, et al. Evolution and morphology of thin films formed by solvent evaporation: an organic semiconductor case study. ACS Appl Mater Interfaces2020; 12(36): 40548–40557.
25.
BrazÁGPochapskiDJPulcinelliSH, et al. Effects of curing temperature and silica content on the structure and properties of a sol–gel PU-silica hybrid coating for corrosion protection. ACS Appl Eng Mater2023; 1(7): 1739–1751.
26.
WangWKLiuKFTsaiPC, et al. Influence of annealing temperature on the properties of ZnGa2O4 thin films by magnetron sputtering. Coatings2019; 9(12): 859.
27.
GuptaSKMisraRD. An experimental investigation on pool boiling heat transfer enhancement using Cu-Al2O3 nanocomposite coating. Exp Heat Transf2019; 32(2): 133–158.
28.
GuptaSKMisraRD. Experimental study of pool boiling heat transfer on copper surfaces with Cu-Al2O3 nanocomposite coatings. Int Commun Heat Mass Transf2018; 97: 47–55.
29.
RaineyKNYouSMLeeS. Effect of pressure, subcooling, and dissolved gas on pool boiling heat transfer from microporous, square pin-finned surfaces in FC-72. Int J Heat Mass Transf2003; 46(1): 23–35.
30.
RaineyKNYouSMLeeS. Effect of pressure, subcooling, and dissolved gas on pool boiling heat transfer from microporous surfaces in FC-72. J Heat Transf2003; 125(1): 75–83.
31.
RohsenowWM. A method of correlating heat transfer data for surface boiling of liquids. J Fluid Eng1952; 74: 969–976.
32.
PioroILRohsenowWDoerfferSS. Nucleate pool-boiling heat transfer. I: review of parametric effects of boiling surface. Int J Heat Mass Transf2004; 47(23): 5033–5044.
33.
GorenfloDChandraUKotthoffS, et al. Influence of thermophysical properties on pool boiling heat transfer of refrigerants. Int J Refrig2004; 27(5): 492–502.
34.
KimYHLeeKJHanD. Pool boiling enhancement with surface treatments. Heat Mass Transf2008; 45(1): 55–60.
35.
ShilBSenDDasAK, et al. Pool boiling performance enhancement of micro/nanoporous coated surfaces fabricated through novel hybrid method. Heat Mass Transf2024; 60: 47–66.
36.
HsuYY. On the size range of active nucleation cavities on a heating surface. J Heat Transf1962; 84: 207–213.
37.
KimBSShinSLeeD, et al. Stable and uniform heat dissipation by nucleate-catalytic nanowires for boiling heat transfer. Int J Heat Mass Transf2014; 70: 23–32.
38.
LeeDLeeNShimDI, et al. Enhancing thermal stability and uniformity in boiling heat transfer using micro-nano hybrid surfaces (MNHS). Appl Therm Eng2018; 130: 710–721.
39.
KumarALaskarNDasMK. Experimental insights of boiling heat transfer over laser-engraved textured surfaces through bubble dynamics study. Int Commun Heat Mass Transf2024; 159: 108176.
40.
GriffithPWallisJD. The role of surface conditions in nucleate boiling. Chem Eng Prog Symp Ser1960; 56: 49–63.
