scholarly journals Asymmetric flows of complex fluids past confined cylinders: A comprehensive numerical study with experimental validation

2020 ◽  
Vol 32 (5) ◽  
pp. 053103 ◽  
Author(s):  
Stylianos Varchanis ◽  
Cameron C. Hopkins ◽  
Amy Q. Shen ◽  
John Tsamopoulos ◽  
Simon J. Haward
Keyword(s):  
Experimental Validation ◽  
Numerical Study ◽  
Complex Fluids ◽  
Asymmetric Flows

Numerical Study and Experimental Validation of Effect of Varying Fiber Crack Density on Stiffness Reduction in CFRP Composites

2018 ◽  
Vol 27 (4) ◽  
pp. 1685-1693 ◽  
Author(s):  
Chandrashekhar P. Hiremath ◽  
K. Senthilnathan ◽  
Niranjan K. Naik ◽  
Anirban Guha ◽  
Asim Tewari
Keyword(s):  
Experimental Validation ◽  
Numerical Study ◽  
Crack Density ◽  
Stiffness Reduction ◽  
Cfrp Composites

scholarly journals Numerical study and experimental validation of a Roots blower with backflow design

2018 ◽  
Vol 12 (1) ◽  
pp. 282-292 ◽  
Author(s):  
Shu-Kai Sun ◽  
Xiao-Han Jia ◽  
Lin-Fen Xing ◽  
Xue-Yuan Peng
Keyword(s):  
Experimental Validation ◽  
Numerical Study

Experimental and Numerical Study of Supersonic Non-ideal Flows for Organic Rankine Cycle Applications

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Miles Robertson ◽  
Peter Newton ◽  
Tao Chen ◽  
Aaron Costall ◽  
Ricardo Martinez-Botas
Keyword(s):  
Experimental Validation ◽  
Numerical Study ◽  
Pressure Ratio ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Helmholtz Energy ◽  
System Level ◽  
Low Grade ◽  
Dense Gas ◽  
Cfd Simulations

Abstract The organic Rankine cycle (ORC) is low-grade heat recovery technology, for sources as diverse as geothermal, industrial, and vehicle waste heat. The working fluids used within these systems often display significant real-gas effects, especially in proximity of the thermodynamic critical point. Three-dimensional (3D) computational fluid dynamics (CFD) is commonly used for performance prediction and flow field analysis within expanders, but experimental validation with real gases is scarce within the literature. This paper therefore presents a dense-gas blowdown facility constructed at Imperial College London, for experimentally validating numerical simulations of these fluids. The system-level design process for the blowdown rig is described, including the sizing and specification of major components. Tests with refrigerant R1233zd(E) are run for multiple inlet pressures, against a nitrogen baseline case. CFD simulations are performed, with the refrigerant modeled by ideal gas, Peng–Robinson, and Helmholtz energy equations of state. It is shown that increases in fluid model fidelity lead to reduced deviation between simulation and experiment. Maximum and mean discrepancies of 9.59% and 8.12% in nozzle pressure ratio with the Helmholtz energy EoS are reported. This work demonstrates an over-prediction of pressure ratio and power output within commercial CFD packages, for turbomachines operating in non-ideal fluid environments. This suggests a need for further development and experimental validation of CFD simulations for highly non-ideal flows. The data contained within this paper are therefore of vital importance for the future validation and development of CFD methods for dense-gas turbomachinery.

scholarly journals Nanofluid-Powered Dual-Fluid Photovoltaic/Thermal (PV/T) System: Comparative Numerical Study

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 775 ◽  
Author(s):  
M. Hussain ◽  
Jin-Hee Kim ◽  
Jun-Tae Kim
Keyword(s):  
Experimental Validation ◽  
Cfd Simulation ◽  
Numerical Study ◽  
Numerical Models ◽  
Metal Oxide Nanoparticles ◽  
Transfer Enhancement ◽  
Ansys Fluent ◽  
Fluctuating Irradiance ◽  
Explicit Dynamic ◽  
T System

A limited number of studies have examined the effect of dual-fluid heat exchangers used for the cooling of photovoltaic (PV) cells. The current study suggests an explicit dynamic model for a dual-fluid photovoltaic/thermal (PV/T) system that uses nanofluid and air simultaneously. Mathematical modeling and a CFD simulation were performed using MATLAB® and ANSYS FLUENT® software, respectively. An experimental validation of the numerical models was performed using the results from the published study. Additionally, to identify the optimal nanofluid type for the PV/T collector, metal oxide nanoparticles (CuO, Al2O3, and SiO2) with different concentrations were dispersed in the base fluid (water). The results revealed that the CuO nanofluid showed the highest thermal conductivity and the best thermal stability compared to the other two nanofluids evaluated herein. Furthermore, the influence of CuO nanofluid in combination with air on the heat transfer enhancement is investigated under different flow regions such as laminar, transition, and turbulent. Using a CuO nanofluid plus air and water plus air the total equivalent efficiency was found to be 90.3% and 79.8%, respectively. It is worth noting that the proposed models could efficiently simulate both single and dual-fluid PV/T systems even under periods of fluctuating irradiance.

scholarly journals Role of fragmentation in as-cast structure: numerical study and experimental validation

China Foundry ◽  
2017 ◽  
Vol 14 (5) ◽  
pp. 321-326 ◽  
Author(s):  
Yong-jian Zheng ◽  
Meng-huai Wu ◽  
A. Kharicha ◽  
A. Ludwig
Keyword(s):  
Experimental Validation ◽  
Numerical Study ◽  
Cast Structure
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