|Title: Analytical and Numerical Investigations for Dynamic Response of Composite Plates Under Various Dynamic Loading with the Influence of Carbon Multi-Wall Tube Nano Materials|
|Author(s): Ehab N. Abbas, Muhsin J. Jweeg, Muhannad Al-Waily
|Pages: 1-10||Paper ID: 180506-9292-IJMME-IJENS||Published: December, 2018|
Abstract: In a previous paper, the effects of carbon multi-wall tube Nano particle materials on the mechanical properties were investigated. The natural frequencies of composite plates manufactured from glass short fiber and polyester resin materials in addition to reinforcement with carbon multi-wall Nano particle materials were calculated. The evaluated results show the increasing of Nano particles which cause an increase of natural frequency and show mechanical properties of composite materials of acceptable limits. Therefore, since the response of plate is very important parameter with a wide vibration application parts, it was necessary to investigate the modification of vibration response for composite materials by reinforcement with Nano materials. In this paper, a modified approach for the previous paper to study the effect of carbon Nano multi-wall tube on the response of the composite plates. The research depends on the mechanical properties evaluated in the previous paper and used here as an input data to the suggested theoretical technique. The analytical and the numerical techniques were used here to evaluate the dynamic vibration response for plate structure. The analytical technique included the evaluation of the response of simply supported plate with different volume fraction of Nano particle materials effect, by deriving the general equation of motion for plate under pulse and ramp loading, and then, evaluation the maximum response of plate as a function of time. In addition, the numerical technique included the evaluation of the response of composite plate by using finite element method (using Ansys program) with various Nano particle volume fraction effect and same plate supported at analytical technique. The comparisons of results show a good agreement of analytical and numerical technique with a maximum discrepancy of (6.54%). Finally, the investigated cases show that the response of plate is decreased with a reasonable percent by reinforcement with Nano multi-wall carbon tube particle materials.
|Keywords: Nano Particles, Vibration , Dynamic, Response, Composite Plate, Nano Composite Material.|
|Full Text (.pdf) | 891 KB|
|Title: Experimental and Theoretical Investigation to Generate Steam by Parabolic Trough Solar Collector with Using Different Heat Transfer Fluids|
|Author(s): Mohammed Hasan Abbood, Mohammed Mohsen Mohammed
|Pages: 11-22||Paper ID: 182106-7474-IJMME-IJENS||Published: December, 2018|
Abstract: This paper describes the mathematical model and experimental tests for parabolic trough solar collector (PTSC). The model is based on detailed energy balances, and it has been applied to evaluate collector thermal performances with different heat transfer fluids. The influence of fluids temperature has been studied from the point of view of heat gain and thermal efficiency. The working fluids which have been selected for this study are hydraulic oil, ethylene glycol based water, and water. An experimental investigation for testing the performance of parabolic trough solar collector (PTSC) is carried out to generate steam at moderate temperature. The tests have been carried out in KERBALA climatic conditions (32.34º N, 44.03º E) during selective days. The results show that the best performance was in case of using hydraulic oil as heat transfer fluid. The maximum enhancement in thermal efficiency was 31.7% between hydraulic oil and water. While the enhancement in the thermal efficiency reaches about 20.4% between ethylene glycol and water.
|Keywords: Solar collector, Concentrated solar collector, Parabolic trough collector, Receiver tube, Thermal efficiency.|
|Full Text (.pdf) | 828 KB|