Experimental study of critical heat flux enhancement during forced convective flow boiling of nanofluid on a short heated surface

The Effect of Micro/Nanoscale Structures on CHF Enhancement

“…A CHF enhancement of 50% was found at 0 m/s, consistent with the pool boiling reported by previous researchers [3][4][5]. After the boiling experiments, Ahn et al, [14,15] used a scanning electron microscope (SEM) to examine the heater surfaces, and they measured the contact angle. They determined that the CHF enhancement was mainly due to nanoparticle deposition on the heater surface during vigorous boiling.…”

“…The wettability of the heating surface decreased due to changes in the surface tension of the working fluid, not due to the surface characteristics. Ahn et al [14,15] investigated aqueous nanofluids with a 0.01% concentration of alumina nanoparticles; the CHF was enhanced under forced convective flow conditions compared with that observed using pure water. They conducted experiments with varying flow velocities, starting from 0 m/s (effectively pool boiling) up to 4 m/s.…”

Application of Spherical Copper Oxide (II) Water Nano-fluid as a Potential Coolant in a Boiling Annular Heat Exchanger

“…Limited application of nano-fluids was demonstrated by Das et al, due to deposition of the nano-fluids on the heating surface, which caused the heat transfer coefficient of nucleate boiling region to significantly deteriorate 13 . Recently, Ahn et al and Sarafraz et al in their experiments showed that using the nano-fluid can enhance the convective and nucleate heat transfer boiling due to increased wettability of the surface as well as thermal conductivity of the fluid [14][15][16] . After publishing our previous works [17][18][19] , we were determined to investigate the convective boiling heat transfer of stabilized dilute CuO 2 ), and weight percentages of 0.1-0.4 on the heat transfer coefficient in both heat transfer regions (forced convection and nucleate boiling) is experimentally investigated.…”

Nanotechnology for Advanced Nuclear Thermal-Hydraulics and Safety: Boiling and Condensation

“…On the other hand, for a mixture of R-134a and polyolester oil with CuO nanoparticles, they found that the heat transfer coefficient increased by more than 100% over the baseline R-134a/polyolester results. Ahn et al [58] investigated flow boiling of a nanofluid on a short heated surface. They used an alumina nanofluid at aconcentration of 0.01v%.…”