Scrutinization of the effects of Grashof number on the flow of different fluids driven by convection over various surfaces

Shah, Nehad Ali; Animasaun, Isaac Lare; Ibraheem, R.O.; Babatunde, H.A.; Sandeep, N.; Pop, Ioan

doi:10.1016/j.molliq.2017.11.042

Cited by 138 publications

(54 citation statements)

References 27 publications

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“…Using the slope linear regression through the data point as suggested in Refs. 61‐65, it is worth remarking that the reduced Nusselt number decreases with viscous dissipation‐related parameter at the rate of

- 0.13981

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Section: Resultsmentioning

confidence: 98%

Generalized differential quadrature analysis of unsteady three‐dimensional MHD radiating dissipative Casson fluid conveying tiny particles

Thumma¹,

2020

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It is worth remarking that little is known about generalized differential quadrature analysis of three‐dimensional flow of non‐Newtonian Casson fluid in the presence of Lorentz force, thermal radiation, haphazard motion of tiny particles, thermomigration of these tiny particles due to temperature gradient, heat source, significant conversion of kinetic energy into internal energy, first‐order chemical reaction, convectively heated horizontal wall, and zero nanoparticles mass flux at the stretching surface. The revised form of Buongiorno's nanofluid model accounted for significant influences of Brownian motion and thermophoresis. The similarity solution was complemented with a powerful collocation procedure based on the generalized differential quadrature method and Newton–Raphson iterative scheme to achieve accuracy and convergent outcomes. The numerical effects disclose that the Casson nanofluid parameter slows down the axial velocities in both directions. Also, the unsteadiness parameter tends to decline generally the temperature throughout the medium and decrease particularly the concentration profile away from the stretching surface. These examinations are applicable in the field of biomechanics, polymer processing, and for characterizing the cement slurries.

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- 0.13981

.…”

Section: Resultsmentioning

confidence: 98%

Generalized differential quadrature analysis of unsteady three‐dimensional MHD radiating dissipative Casson fluid conveying tiny particles

Thumma¹,

2020

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“…18a and 19a, which provide the lift coefficient for the entire RG15 airfoil family, as a function of the angle of attack. Additional information about the behaviour of (L∕D) max and C L max with Re can be obtained by observing Table 6, which presents the increase rate of (L∕D) max and C L max due to the increase of Re (i.e., the rate of change in (L∕D) max and C L max as Re changes) for each airfoil of the RG15 family, using the slope of the linear regression line through data points suggested in [37,38]. According to Table 6, Re has a higher impact on (L∕D) max , as the relative thickness of the airfoil increases.…”

Section: Xfoil Resultsmentioning

confidence: 99%

Low Reynolds airfoil family for small horizontal axis wind turbines based on RG15 airfoil

et al. 2020

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The present study introduces a low Reynolds number (Re) airfoil family for the entire blade span of small wind turbines, aiming to reduce the effects related to laminar separation, improve startup response and meet acceptable levels of structural integrity. Six airfoils of varying relative thickness were designed by increasing the thickness distribution of RG15 airfoil up to 50% and adopting a rounded trailing edge with a diameter equal to 1% of the chord length. The aerodynamic performance of RG15 family was initially evaluated by means of XFOIL code at several low Reynolds numbers ranging from 60,000 to 300,000 and angles of attack between − 6° and 14°. XFOIL analysis revealed that increasing relative thickness leads to the reduction of maximum lift-to-drag ratio (C L ∕C D ) . However, this percentage reduction decreases with increasing Re. The maximum reduction in maximum C L ∕C D was found at 60,000 Re for the thickest airfoil of RG15 family. Conversely, a growth of maximum lift coefficient (C L ) was observed by increasing relative thickness. Besides, a Reynolds-Averaged Navier-Stokes (RANS) analysis was also conducted at 300,000 Re to get additional information on the flow characteristics. Comparisons between the XFOIL and RANS data were performed. The results of RANS simulations were generally in accordance with those of XFOIL. However, notable over-estimations of drag coefficient (C D ) were detected. The behavior of the recirculation area behind the rounded trailing edge and that of the separation bubble near the leading edge for different values of relative thickness and angle of attack was examined. Thickening of the airfoils was found to have a beneficial impact on the appearance of separation bubbles, while no significant effect of the rounded trailing edge on C L and C D was observed.

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“…As a result, the above calculated values are placed in equation, mole number of the fuel for annual energy needs is calculated, and the masses of fuel and carbon dioxide are determined.

m_{{CH}_{4}} = n M_{{CH}_{4}}

m_{{CO}_{2}} = n M_{{CO}_{2}}

…”

Section: Discussionmentioning

confidence: 99%

“…The optimal level of the effect of this parameter on the physical properties of the flow was determined for each publication and the slope of the linear regression line and Grashof number/vitality parameter were estimated with the known data points for each publication. It was stated that Slp (slope of the linear regression line) approach was useful in comparing the results and to determine the increase‐reduction amounts of the trend . The aim of this research was to examine innovative sound and thermal insulation materials consisting of natural and/or recycling materials.…”

Section: Introductionmentioning

confidence: 99%

“…It was stated that Slp (slope of the linear regression line) approach was useful in comparing the results and to determine the increase-reduction amounts of the trend. 10 The aim of this research was to examine innovative sound and thermal insulation materials consisting of natural and/or recycling materials. In this study, the sustainability of innovative insulation materials, short analysis of fire and steam resistance, material properties in sound and thermal insulation, important technical parameters and the variety of these insulation materials have been reported.…”

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confidence: 99%

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Calculation of optimum insulation thickness of external walls in residential buildings by using exergetic life cycle cost assessment method: Case study for Turkey

Guven

2019

Env Prog and Sustain Energy

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Energy is one of the most fundamental event of the universe and it is impossible to imagine an area where energy is not used. The energy demand is also increasing with the ever‐increasing population of the world. We also use energy to meet our heating and cooling needs. Heat loss from the exterior walls of buildings is important, so thermal insulation on the wall is very critical. In this study, optimum insulation thickness is determined for four provinces and two different insulation materials selected from four different climatic regions of Turkey. In order to calculate insulation thicknesses, the number of the degree‐day and exergetic environmental impact factor have been used. Natural gas is used as fuel. By using exergetic life cycle cost assessment method for rock wool and glass wool as insulation materials, the changes of CO2 emission values, the environmental impact factor, and energy saving values are determined for optimum insulation thickness. The optimum insulation thickness, which are calculated by using the number of the degree‐day and exergetic environmental impact factor for glass wool and rock wool is 0.1103 m and 0.04375 m for Antalya, 0.1667 m and 0.07292 m for Isparta, 0.1667 m and 0.0625 m for Bursa, and 0.2188 m and 0.1021 m for Erzurum, respectively. The reduction of carbon dioxide emission values for glass wool and rock wool 86% and 64% for Antalya, 90% and 76% for Isparta, 92% and 82% for Erzurum, and 90% and 73% for Bursa, respectively. Net exergetic environmental impact saving values for glass wool and rock wool: 589 mPts/m2‐yr and 342 mPts/m2‐yr for Antalya, 1,318 mPts/m2‐yr and 642 mPts/m2‐yr for Bursa, 1,315 mPts/m2‐yr and 878 mPts/m2‐yr for Erzurum, and 2,248 mPts/m2‐yr and 1,687 mPts/m2‐yr for Isparta, respectively.

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Scrutinization of the effects of Grashof number on the flow of different fluids driven by convection over various surfaces

Cited by 138 publications

References 27 publications

Generalized differential quadrature analysis of unsteady three‐dimensional MHD radiating dissipative Casson fluid conveying tiny particles

Generalized differential quadrature analysis of unsteady three‐dimensional MHD radiating dissipative Casson fluid conveying tiny particles

Low Reynolds airfoil family for small horizontal axis wind turbines based on RG15 airfoil

Calculation of optimum insulation thickness of external walls in residential buildings by using exergetic life cycle cost assessment method: Case study for Turkey

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