Abstract
The water-based single- and multiple-wall carbon nanotubes nanofluid over the surface of an unsteady stretched cylinder has been studied. The thin film of the carbon-nanotube nanofluid has been focused for the heat transfer enhancement applications. The well-known thermal conductivity model for the revolving tube materials like single- and multiple-walled carbon nanotubes defined by Xue were used. The modeled problem has been solved through the optimal homotopy analysis method using the BVPh 2.0 package. The distribution of the thin layer has been regulated through the pressure term using the variable thickness of the nanoliquid. The entropy generation has mainly focused during the motion of the thin layer for the both sorts of carbon nanotubes. The important features of the entropy generation and Bejan number under the influence of the physical constraints have been compared for the both types of single-wall carbon nanotubes and multiple-wall carbon nanotubes and discussed. The well-known BVPh 2.0 package of the optimal homotopy analysis method has been used to find the outcomes.
Highlights
The suspension of micro large size solid particle in the base fluids gives a remarkable change in their thermal, mechanical, optical, and electronic properties because the thermal efficiency of the solids is much more than that of fluids
The CNTs are further divided into two classes, known as single-wall carbon nanotubes (SWCNTs) and multiple-wall carbon nanotubes
SWCNTs are fashioned by a packaging layer of carbon with one atom thick layer, whereas the MWCNTs contain multiple rolled layers of carbon
Summary
The suspension of micro large size solid particle in the base fluids gives a remarkable change in their thermal, mechanical, optical, and electronic properties because the thermal efficiency of the solids is much more than that of fluids. The family of carbon plays an imperative role to growth the thermal conductivity of the base fluids. One of the well-known families of carbon called carbon nanotubes (CNTs) have been utilized in most of the recent research fields for the thermal and cooling applications. The CNTs are further divided into two classes, known as single-wall carbon nanotubes (SWCNTs) and multiple-wall carbon nanotubes. SWCNTs are fashioned by a packaging layer of carbon with one atom thick layer, whereas the MWCNTs contain multiple rolled layers of carbon. The SWCNTs need catalysts for their fusion, whereas the MWCNTs are complex structured and can be fashioned without any catalyst
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