Slip velocity and temperature jump of a non-Newtonian nanofluid, aqueous solution of carboxy-methyl cellulose/aluminum oxide nanoparticles, through a microtube

2019 ◽  
Vol 29 (5) ◽  
pp. 1606-1628 ◽  
Author(s):  
Marjan Goodarzi ◽  
Saeed Javid ◽  
Ali Sajadifar ◽  
Mehdi Nojoomizadeh ◽  
Seyed Hossein Motaharipour ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Aqueous Solution ◽  
Aluminum Oxide ◽  
Temperature Jump ◽  
Methyl Cellulose ◽  
Oxide Nanoparticles ◽  
Carboxy Methyl Cellulose ◽  
Aluminum Oxide Nanoparticles ◽  
Content Type ◽  
Carboxy Methyl

Purpose With respect to two new subjects, i.e. nanofluids and microchannels, in heat transfer systems and modern techniques used for building them, this paper aims to study on effect of using aluminum oxide nanoparticles in non-Newtonian fluid of aqueous solution of carboxy-methyl cellulose in microtube and through application of different slip coefficients to achieve various qualities on surface of microtube. Design/methodology/approach Simultaneously, the effect of presence of nanoparticles and phenomenon of slip and temperature jump has been explored in non-Newtonian nanofluid in this essay. The assumption of homogeneity of nanofluid and fixed temperature of wall in microtube has been used in modeling processes. Findings The results have been presented as diagrams of velocity, temperature and Nusselt Number and the investigations have indicated that addition of nanoparticles to the base fluid and increase in microtube slip coefficient might improve rate of heat transfer in microtube. Originality/value The flow of non-Newtonian nanofluid of aqueous solution of carboxy methyl cellulose-aluminum oxide has been determined in a microtube for the first time.

Experimental Investigation of Temperature Dependent Thermal Conductivity of Aluminum Oxide and CNT Heat Transfer Fluids

2016 ◽  
Author(s):  
David Calamas ◽  
John Willis ◽  
Zachary Wilkes ◽  
Mosfequr Rahman ◽  
Daniel Dannelley
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Aluminum Oxide ◽  
Base Fluid ◽  
Experimental Methodology ◽  
Oxide Nanoparticles ◽  
Outer Diameter ◽  
Aluminum Oxide Nanoparticles ◽  
Heat Transfer Fluids ◽  
Multi Walled Carbon Nanotubes

Nanofluids often exhibit superior heat transfer characteristics when compared with conventional heat transfer fluids. The increase in thermal conductivity due to the presence of various nanoparticles was experimentally examined using commercially available equipment that utilizes the two thickness method. The thermal conductivity of 10 and 30 nm aluminum oxide nanoparticles suspended in distilled water at concentrations of 2% and 5% was measured for a temperature range of 15°C to 70°C in increments of 5°C. For a 2% concentration of 10 nm aluminum oxide the experimentally derived thermal conductivity deviated from the theoretical thermal conductivity predicted by Maxwell by an average of 1.55%. The average percent increase in the thermal conductivity of the base fluid due to the presence of 10 nm aluminum oxide nanoparticles was found to be 4.17 and 4.90% for concentrations of 2 and 5% respectively. The presence of 30 nm nanoparticles resulted in a greater discrepancy with the theoretical model developed by Maxwell, regardless of concentration. In addition, the presence of 10 nm aluminum oxide nanoparticles resulted in a greater increase in thermal conductivity when compared with 30 nm aluminum oxide nanoparticles. In addition, the thermal conductivity of a base fluid dispersed with multi-walled carbon nanotubes (MWNTs) with an outer diameter ranging from 13–18 nm and a length ranging from 3–30 micrometers (μm) was examined. The presence of a 0.2% concentration of MWNTs resulted in an average increase in thermal conductivity of 0.31%. Unfortunately, there was a large standard deviation in the results for the MWNTs and significant fluctuations with temperature. While this experimental methodology may be sufficient for metal based nanofluid particles it may be undesirable for fluids enhanced by MWNTs.

scholarly journals Impact of Methyl Cellulose Surfactant in Uniform Dispersion of Carbon Nanotube Suspension

2020 ◽  
pp. 308-310
Author(s):  
Dhivyasri G ◽  
Flavia Princess Nesamani I ◽  
Manikandan M ◽  
Vijay Kumar Varatharan V ◽  
Seenuva samurthi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carbon Nanotube ◽  
Surface Morphology ◽  
Silicon Substrate ◽  
Methyl Cellulose ◽  
Carboxy Methyl Cellulose ◽  
Cellulose Sample ◽  
Uniform Dispersion ◽  
Organic Solutions ◽  
Carboxy Methyl

In this paper, experimental synthesis of uniform dispersion of carbon nanotube using four different surfactants have been presented. Carboxy Methyl Cellulose sample is a better surfactant to disperse CNT in an aqueous solution rather than in organic solutions. The uniformly dispersed sample is coated on silicon substrate and the surface morphology is studied using AFM and SEM and I-V characteristics are studied for the effective sample using PXI 4110 slot of National Instruments.

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