Abstract
The wet ball milling method was used and a dispersant (gum Arabic) was added to prepare various concentrations (0.05 and 0.2 wt%) of carbon-based nanofluids (CBNFs) by a two-step synthesis method as working fluids for heat exchange. CBNFs were actually used in a tube heat exchanger (THE) for heat transfer performance experiments. The heat transfer performance of water and CBNFs was estimated under different heating powers and flow rates of working fluid. The pump power consumption (Ppe) of 0.05 wt% CBNF was found to be similar to that of water, but the Ppe of 0.2 wt% CBNF was higher than that of water. The convective heat transfer coefficient (HTC) of CBNF in the was higher than that of water, and the HTC of 0.05 wt% and 0.2 wt% CBNF was optimal at the heating power of 120 W and 80 W, respectively. The average HTC of 0.05 wt% CBNFs at 120 W heating power was about 3.33% higher than that of water, while that of 0.2 wt% CBNFs at 80 W heating power was about 4.52% higher than that of water. Considering the Ppe and HTC concomitantly, the best overall system performance was exhibited by 0.05 wt% CBNFs.
Highlights
Research on nanofluids in heat exchange, energy storage, and thermal collection systems has been very vigorous in recent years, and most studies show that nanofluids (NFs) can effectively improve system efficiency and operating performance in these systems [1,2,3,4,5]
carbon-based nanofluids (CBNFs) have been commonly used in heat exchange, thermal storage, and thermal collection systems to improve system performance [6,7,8,9,10]
The CBNFs were used in a tube heat exchanger (THE) for heat transfer performance experiments
Summary
Research on nanofluids in heat exchange, energy storage, and thermal collection systems has been very vigorous in recent years, and most studies show that nanofluids (NFs) can effectively improve system efficiency and operating performance in these systems [1,2,3,4,5]. CBNMs mainly include single-walled nanotubes (SWCNTs), double-walled carbon nanotubes (DWCNTs), multi-walled carbon nanotubes (MWCNTs), graphene (GN), graphene nanoplatelets (GNP), graphene oxide (GO), and reduced graphene oxide. Most of these materials have excellent stability and thermal properties. CBNFs have been commonly used in heat exchange, thermal storage, and thermal collection systems to improve system performance [6,7,8,9,10]. High-performance CBNFs should have considerable potential in the application of relevant cutting-edge technologies in the future [11]
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