EXPERIMENTAL CAMPAIGN FOR THE STUDY OF THE STEAM CONDENSATION INSIDE TUBES IN PRESENCE OF HIGH PERCENTAGE OF NONCONDENSABLES

1998 ◽  
Author(s):  
Fabrizio Cumo ◽  
Livio De Santoli ◽  
Gino Moncada Lo Giudice ◽  
Gianfranco Caruso ◽  
A. Naviglio
Keyword(s):  
Steam Condensation ◽  
Experimental Campaign

Methodology to Investigate Vibration Phenomena Caused by the Steam Condensation at Subatmospheric Condition

2017 ◽  
Author(s):  
R. Lo Frano ◽  
D. Mazed ◽  
D. Aquaro ◽  
D. Del Serra ◽  
I. Sekachev ◽  
...  
Keyword(s):  
Direct Contact ◽  
Vacuum Vessel ◽  
Nuclear Engineering ◽  
Atmospheric Conditions ◽  
Steam Condensation ◽  
The Past ◽  
Experimental Campaign ◽  
Hydraulic Conditions ◽  
Contact Condensation ◽  
Suppression System

The phenomenon of steam-water direct contact condensation (DCC) was widely investigated in the past because of conventional and nuclear engineering applications, like in the safety suppression system of BWRs. When steam is injected into a sub cooled water, different condensation regimes can be observed, such as chugging, condensation oscillation, bubbling condensation oscillation etc. (these have been identified during the experimental campaign on condensation of steam injected into water at sub-atmospheric conditions carried out at Lab. B. Guerrini of DICI - University of Pisa). According to the thermal hydraulic conditions of the condensing jet plume, vibrations may arise. This paper so deals with the analysis of vibration phenomena that originate during the steam-water direct contact condensation at sub-atmospheric conditions, not treated till today. Numerical investigations (by proper FEM code) as well as experimental activity will be presented and discussed in order to evaluate if vibrations are capable to jeopardise this safety suppression system, which is designed to protect Vacuum Vessel of ITER from pressurizing accidents.

scholarly journals Experimental Testing and Analytical Modeling of Asymmetric End-Notched Flexure Tests on Glass-Fiber Metal Laminates

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 56 ◽  
Author(s):  
Konrad Dadej ◽  
Jarosław Bieniaś ◽  
Paolo Sebastiano Valvo
Keyword(s):  
Glass Fiber ◽  
Experimental Testing ◽  
Metal Composite ◽  
Interface Model ◽  
Experimental Campaign ◽  
Composite Interface ◽  
Theoretical Predictions ◽  
Elastic Interface ◽  
Fiber Metal ◽  
Rigid Interface

An experimental campaign on glass-fiber/aluminum laminated specimens was conducted to assess the interlaminar fracture toughness of the metal/composite interface. Asymmetric end-notched flexure tests were conducted on specimens with different fiber orientation angles. The tests were also modeled by using two different analytical solutions: a rigid interface model and an elastic interface model. Experimental results and theoretical predictions for the specimen compliance and energy release rate are compared and discussed.

Effects of inclination and flow velocity on steam condensation consisting of air on tube bundle external surfaces

2021 ◽  
Vol 136 ◽  
pp. 103722
Author(s):  
Gonglin Li ◽  
Boyang Cao ◽  
Shuhang Zhou ◽  
Haozhi Bian ◽  
Ming Ding
Keyword(s):  
Flow Velocity ◽  
Tube Bundle ◽  
Steam Condensation

scholarly journals Adaptive Ultrasound-Based Tractor Localization for Semi-Autonomous Vineyard Operations

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 287
Author(s):  
Matteo Corno ◽  
Sara Furioli ◽  
Paolo Cesana ◽  
Sergio M. Savaresi
Keyword(s):  
Autonomous Navigation ◽  
Incidence Angle ◽  
Autonomous Driving ◽  
Localization Algorithm ◽  
Robust Performance ◽  
Cluttered Environment ◽  
Experimental Campaign ◽  
Commercial Applications ◽  
Agricultural Tractors ◽  
Selection Stage

Autonomous driving is greatly impacting intensive and precise agriculture. Matter-of-factly, the first commercial applications of autonomous driving were in autonomous navigation of agricultural tractors in open fields. As the technology improves, the possibility of using autonomous or semi-autonomous tractors in orchards and vineyards is becoming commercially profitable. These scenarios offer more challenges as the vehicle needs to position itself with respect to a more cluttered environment. This paper presents an adaptive localization system for (semi-) autonomous navigation of agricultural tractors in vineyards that is based on ultrasonic automotive sensors. The system estimates the distance from the left vineyard row and the incidence angle. The paper shows that a single tuning of the localization algorithm does not provide robust performance in all vegetation scenarios. We solve this issue by implementing an Extended Kalman Filter (EKF) and by introducing an adaptive data selection stage that automatically adapts to the vegetation conditions and discards invalid measurements. An extensive experimental campaign validates the main features of the localization algorithm. In particular, we show that the Root Mean Square Error (RMSE) of the distance is 16 cm, while the angular RMSE is 2.6 degrees.

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