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Pool boiling of water-Al2O3 and water-Cu nanofluids on horizontal smooth tubes.

Cieslinski JT, Kaczmarczyk TZ - Nanoscale Res Lett (2011)

Bottom Line: Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight.The horizontal smooth copper and stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed test heater.The results indicate that independent of concentration nanoparticle material (Al2O3 and Cu) has almost no influence on heat transfer coefficient while boiling of water-Al2O3 or water-Cu nanofluids on smooth copper tube.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Ecoengineering and Process Apparatus, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland. jcieslin@pg.gda.pl.

ABSTRACT
Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e., water-Al2O3 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth copper and stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed test heater. The experiments have been performed to establish the influence of nanofluids concentration as well as tube surface material on heat transfer characteristics at atmospheric pressure. The results indicate that independent of concentration nanoparticle material (Al2O3 and Cu) has almost no influence on heat transfer coefficient while boiling of water-Al2O3 or water-Cu nanofluids on smooth copper tube. It seems that heater material did not affect the boiling heat transfer in 0.1 wt.% water-Cu nanofluid, nevertheless independent of concentration, distinctly higher heat transfer coefficient was recorded for stainless steel tube than for copper tube for the same heat flux density.

No MeSH data available.


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Heat transfer coefficient during boiling of water-Cu (1%) nanofluid.
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Figure 22: Heat transfer coefficient during boiling of water-Cu (1%) nanofluid.

Mentions: Figures 17, 18, 19, 20, 21, and 22 show influence of heating surface material (tube material) on heat transfer while boiling of water-Al2O3 or water-Cu nanofluids of different concentrations. Figures 17 and 18 illustrate boiling curves of smooth stainless steel and copper tubes in water-Al2O3 nanofluid with 0.01% and 1% nanoparticle concentrations, respectively. Independent of concentration (0.01% and 1%) distinctly higher heat transfer coefficient was recorded for stainless steel tube - Figures 19 and 20, respectively. Figures 21 and 22 illustrate heat transfer coefficient against heat flux density for smooth stainless steel and copper tubes in water-Cu nanofluid with 0.1% and 1% nanoparticle concentrations, respectively. It seems that surface material does not affect the boiling heat transfer in 0.1% water-Cu nanofluid - Figure 21, but for 1% nanoparticle concentration, again like for water-Al2O3 nanofluid (Figure 17) distinctly higher heat transfer coefficient was recorded for stainless steel tube - Figure 22.


Pool boiling of water-Al2O3 and water-Cu nanofluids on horizontal smooth tubes.

Cieslinski JT, Kaczmarczyk TZ - Nanoscale Res Lett (2011)

Heat transfer coefficient during boiling of water-Cu (1%) nanofluid.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211278&req=5

Figure 22: Heat transfer coefficient during boiling of water-Cu (1%) nanofluid.
Mentions: Figures 17, 18, 19, 20, 21, and 22 show influence of heating surface material (tube material) on heat transfer while boiling of water-Al2O3 or water-Cu nanofluids of different concentrations. Figures 17 and 18 illustrate boiling curves of smooth stainless steel and copper tubes in water-Al2O3 nanofluid with 0.01% and 1% nanoparticle concentrations, respectively. Independent of concentration (0.01% and 1%) distinctly higher heat transfer coefficient was recorded for stainless steel tube - Figures 19 and 20, respectively. Figures 21 and 22 illustrate heat transfer coefficient against heat flux density for smooth stainless steel and copper tubes in water-Cu nanofluid with 0.1% and 1% nanoparticle concentrations, respectively. It seems that surface material does not affect the boiling heat transfer in 0.1% water-Cu nanofluid - Figure 21, but for 1% nanoparticle concentration, again like for water-Al2O3 nanofluid (Figure 17) distinctly higher heat transfer coefficient was recorded for stainless steel tube - Figure 22.

Bottom Line: Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight.The horizontal smooth copper and stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed test heater.The results indicate that independent of concentration nanoparticle material (Al2O3 and Cu) has almost no influence on heat transfer coefficient while boiling of water-Al2O3 or water-Cu nanofluids on smooth copper tube.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Ecoengineering and Process Apparatus, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland. jcieslin@pg.gda.pl.

ABSTRACT
Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e., water-Al2O3 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth copper and stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed test heater. The experiments have been performed to establish the influence of nanofluids concentration as well as tube surface material on heat transfer characteristics at atmospheric pressure. The results indicate that independent of concentration nanoparticle material (Al2O3 and Cu) has almost no influence on heat transfer coefficient while boiling of water-Al2O3 or water-Cu nanofluids on smooth copper tube. It seems that heater material did not affect the boiling heat transfer in 0.1 wt.% water-Cu nanofluid, nevertheless independent of concentration, distinctly higher heat transfer coefficient was recorded for stainless steel tube than for copper tube for the same heat flux density.

No MeSH data available.


Related in: MedlinePlus