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Efficient operation of thermal solar power plants is strongly dependent on the central receiver design. In particular, as the receiver tube determines the temperature behavior inside the receiver, its geometry proves to be the main factor affecting the solar tower receiver performances. This paper investigates the effect of several 3D geometric concepts on both temperature evolution and velocity of the working fluid at the receiver, in order to obtain an enhanced design, with augmented efficiency. A novel receiver tube with helical fins is proposed, aiming an increased heat exchange surface and improved thermal conduction. Extensive numerical simulation is carried out in ANSYS CFX (CFD) to assess the performances of the proposed solar tower receiver design. An unstructured mesh, generated by a computation machine, and (kε) turbulence model are employed to this regard. The results show that the tubes with helical fins for solar tower receivers give a very important increase in the outlet temperature, which can reach up to 1050 K.
Messaoud Hazmoune; Benaoumeur Aour; Xavier Chesneau; Mohammed Debbache; Dana-Alexandra Ciupageanu; Gheorghe Lazaroiu; Mohamed Hadjiat; Abderrahmane Hamidat. Numerical Analysis of a Solar Tower Receiver Novel Design. Sustainability 2020, 12, 6957 .
AMA StyleMessaoud Hazmoune, Benaoumeur Aour, Xavier Chesneau, Mohammed Debbache, Dana-Alexandra Ciupageanu, Gheorghe Lazaroiu, Mohamed Hadjiat, Abderrahmane Hamidat. Numerical Analysis of a Solar Tower Receiver Novel Design. Sustainability. 2020; 12 (17):6957.
Chicago/Turabian StyleMessaoud Hazmoune; Benaoumeur Aour; Xavier Chesneau; Mohammed Debbache; Dana-Alexandra Ciupageanu; Gheorghe Lazaroiu; Mohamed Hadjiat; Abderrahmane Hamidat. 2020. "Numerical Analysis of a Solar Tower Receiver Novel Design." Sustainability 12, no. 17: 6957.
The shoulder is the most mobile joint of the human body, but it is very fragile; several pathologies, and especially muscular degenerations in the elderly, can affect its stability. These are more commonly called rotator cuff fractures. In the case of this type of pathology, the mobility of the shoulder decreases and pain appears. In order to restore mobility and reduce pain, implantation of an inverted shoulder prosthesis is recommended. Unfortunately, over time a notch phenomenon has been observed. In the lower position of the arm, part of the implant comes into contact with the scapula and therefore causes deterioration of the bone. Among the solutions adopted is the lateralized method with bone grafting. However, a main disadvantage of this method concerns the reconstruction of the graft in the case of prosthesis revision. In this context, the aim of the present work was to reconstruct the shoulder joint in 3D in order to obtain a bio-faithful geometry, and then study the behavior of different types of biomaterials that can replace bone grafting. To this end, three arm abduction motions were examined for three individuals. From the results obtained, it appears that grafts in ultra-high molecular weight polyethylene (UHMWPE) exhibit a behavior closer to that of bones.
Salah Mebarki; Benaoumeur Aour; Franck Jourdan; Etienne Malachanne; Abdel Hakem Belaghit. A Study of the Biomechanical Behavior of the Implantation Method of Inverted Shoulder Prosthesis (BIO–RSA) under Different Abduction Movements. Bioengineering 2019, 6, 19 .
AMA StyleSalah Mebarki, Benaoumeur Aour, Franck Jourdan, Etienne Malachanne, Abdel Hakem Belaghit. A Study of the Biomechanical Behavior of the Implantation Method of Inverted Shoulder Prosthesis (BIO–RSA) under Different Abduction Movements. Bioengineering. 2019; 6 (1):19.
Chicago/Turabian StyleSalah Mebarki; Benaoumeur Aour; Franck Jourdan; Etienne Malachanne; Abdel Hakem Belaghit. 2019. "A Study of the Biomechanical Behavior of the Implantation Method of Inverted Shoulder Prosthesis (BIO–RSA) under Different Abduction Movements." Bioengineering 6, no. 1: 19.
Among various severe plastic deformation methods, equal channel angular pressing (ECAP) is an effective tool to introduce large plastic deformation of simple shear. The principle consists to extrude the sample several times through two intersecting channels with the aim to improve the mechanical properties of the material by altering the morphology of its microstructure. In this work, a numerical and experimental investigation of a typical semi-crystalline thermoplastic polymer (high density polyethylene, HDPE) during two-turn ECAP (2-ECAP) using 90° and 120° dies has been presented. The warping of the extruded samples has been also highlighted experimentally. The material parameters of an elasto-viscoplastic constitutive law were identified using compressive tests at different temperatures and strain rates. The effects of the main parameters, such as, the channel angles, the dimensions of the intermediate channel, the friction and the temperature have been analyzed. Finally, to confirm the numerical results, two dies composed of one elbow (1-ECAP) and two elbows (2-ECAP) have been manufactured and tested. It was found that the warping obtained using 2-ECAP die is more reduced than that of 1-ECAP die even with several passes.
Ali Mitsak; Benaoumeur Aour. Numerical and experimental investigation of HDPE behavior during 2-ECAP process using 90° and 120° dies. Journal of the Brazilian Society of Mechanical Sciences and Engineering 2016, 39, 2055 -2069.
AMA StyleAli Mitsak, Benaoumeur Aour. Numerical and experimental investigation of HDPE behavior during 2-ECAP process using 90° and 120° dies. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2016; 39 (6):2055-2069.
Chicago/Turabian StyleAli Mitsak; Benaoumeur Aour. 2016. "Numerical and experimental investigation of HDPE behavior during 2-ECAP process using 90° and 120° dies." Journal of the Brazilian Society of Mechanical Sciences and Engineering 39, no. 6: 2055-2069.