Modeling of a bio-inspired soft arm with semicircular cross section for underwater grasping

2021 ◽  
Author(s):  
shengkai Liu ◽  
Jian Jiao ◽  
Wenchao Kong ◽  
Haiming Huang ◽  
Tao Mei ◽  
...  
Keyword(s):  
Cross Section ◽  
Semicircular Cross Section

Design of Printed Circuit Heat Exchanger (PCHE) for LNG Re-Gasification System

2017 ◽  
Author(s):  
Seok Ho Yoon ◽  
Jeong Heon Shin ◽  
Dong Ho Kim ◽  
Jun Seok Choi
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Optimal Design ◽  
Cross Section ◽  
Diffusion Bonding ◽  
Analytical Calculation ◽  
Analytical Tool ◽  
Printed Circuit ◽  
Simulation Results ◽  
Semicircular Cross Section

In this paper, we present the ongoing process of the research and development of the Printed Circuit Heat Exchanger (PCHE) on Floating Storage Regasification Unit (FSRU). We performed a structural simulation work to find the optimal design of fluid channels on heat transfer plates, fabricated the heat transfer plates, and calculated the capacity of the PCHE using our analytical tool. In the simulation work, the plates having channels of 1 mm semicircular cross section were designed by varying the wall thickness between channels. At a temperature, 1373 K, compressing pressures were varied as 30, 85.7, and 500 bars. Based on the simulation results, we fabricated and bonded heat transfer plates using the diffusion bonding equipment which our department developed. Then, the sizing of PCHE was done with analytical calculation for the developing PCHE on FSRU.

scholarly journals Theory of Heat Exchange in Pipes With Turbulators With d/D = 0.95 ÷ 0.90 And t/D = 0.25 ÷ 1.00, and Also in Rough Pipes, by Air With Great Reynold’s Numbers Re = 106

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Lobanov Igor Evgenjevich
Keyword(s):  
Heat Exchange ◽  
Cross Section ◽  
Energy Equation ◽  
Stress Transfer ◽  
Reynolds Numbers ◽  
Transfer Model ◽  
Computational Studies ◽  
Structured Grids ◽  
Multi Scale ◽  
Semicircular Cross Section

Mathematical modeling of heat exchange in air in pipes with turbulators with d / D = 0.95 ÷ 0.90 and t / D = 0.25 ÷ 1.00, as well as in rough pipes, with large Reynolds numbers (Re = 106). The solution of the heat exchange problem for semicircular cross-section flow turbulizers based on multi-block computing technologies based on the factorized Reynolds equations (closed using the Menter shear stress transfer model) and the energy equation (on multi-scale intersecting structured grids) was considered. This method was previously successfully applied and verified by experiment in [1-4] for lower Reynolds numbers. The article continues the computational studies initiated in [1-4,25-27].

Friction Force of the Sliding Surface with Pores Having a Semicircular Cross Section Form

2016 ◽  
Vol 4 (2) ◽  
pp. 1-22 ◽  
Author(s):  
Leonid Burstein
Keyword(s):  
Friction Force ◽  
Cross Section ◽  
Control Cell ◽  
Hydrodynamic Pressure ◽  
Friction Forces ◽  
Cell Dimensions ◽  
The Mathematical Model ◽  
Selection Of ◽  
Semicircular Cross Section ◽  
Section Form

A theoretical solution of the mathematical model is represented for obtaining the hydrodynamic pressure and friction force of the non-contacting sliding surfaces with pores having a semicircular cross section form. The expressions for the hydrodynamic pressure, shear stress, and friction force were obtained for a control cell that includes the inside and outside of the pore areas. The pore radii have been studied in the range from 0.5µm to about 18 µm. The parametric study of the pore performance is obtained with the specially written MATLAB program used the theoretically defined expressions. It is found that better performance in terms of positive hydrodynamic pressure and optimal friction forces can be achieved with proper selection of pore and outside of pore sizes. Better hydrodynamic pressures were observed at the gap-pore radii and cell-pore radii ratios range between 0.5 … 1 and 2.5 … 5, respectively. The maximal friction forces are achieved at pore radii values about 0.64 of the cell dimensions, which correspond to a r1 range of about 5 … 13 µm.

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