Experimental investigation of surface roughness effect on a free-flight sphere in a Ludwieg tube

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Related publications (26)

Hydrodynamic loading of perforated disks in creeping flows

François Gallaire, Lorenzo Siconolfi, Pedro Miguel Nunes Pereira de Almeida Reis, Matteo Pezzulla

We present results from an experimental investigation of a viscous fluid driven through and around porous disks at low and moderate Reynolds number conditions: Re = O(10(-4)-10(-3)) and Re = O(1-10). Specifically, we quantify the hydrodynamic drag that the ...

AMER PHYSICAL SOC2019

Compliant riblets: Problem formulation and effective macrostructural properties

Alessandro Bottaro, Giuseppe Antonio Zampogna

Small-scale, deformable riblets, embedded within the viscous sublayer of a turbulent boundary layer and capable to adapt to the overlying motion, are studied. The wall micro-grooves are made of a linearly elastic material and can undergo small deformations ...

2019

Control of Dissipation Sources: A Central Aspect for Enhancing the Mechanical and Mechanobiological Performances of Hydrogels

Dominique Pioletti, Naser Nasrollahzadeh Mamaghani, Peyman Karami

Development of mechanically durable and biologically inductive hydrogels is a major challenge for load-bearing applications such as engineered cartilage. Dissipative capacity of articular cartilage is central to its functional behavior when submitted to lo ...

2019

Reducing the Energy Consumption of Electric Buses With Design Choices and Predictive Driving

Francesco Baldi

Transportation electrification is increasing and recently-more focus has been directed on heavy vehicles and especially on city buses. Battery electric buses are inherently more energy efficient than diesel buses and the efficiency can be further increased ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2019

Small satellites for space science A COSPAR scientific roadmap

Jie Wu, Maurice Borgeaud, Volker Gass

This is a COSPAR roadmap to advance the frontiers of science through innovation and international collaboration using small satellites. The world of small satellites is evolving quickly and an opportunity exists to leverage these developments to make scien ...

ELSEVIER SCI LTD2019

Nearing final design of the ITER EC H&CD Upper Launcher

René Chavan, Timothy Goodman, Olivier Sauter, Jean-Daniel Landis, Robert Bertizzolo, Emanuele Poli, Florian Ramseyer, Matteo Vagnoni

The ITER ECRH system consists of 24 gyrotrons with up to 24 MW installed millimeter wave heating power at 170 GHz, power supplies, control system, transmission lines, one Equatorial and the four Upper Launchers. With its high frequency and small beam focus ...

ELSEVIER SCIENCE SA2019

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