Abstracts – Browse Results
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Almazrouei, M, Khalizani, K and Davidson, R (2021) Safety climate of UAE petroleum industry: a cross-validation using confirmatory factor analytic approach. Journal of Engineering, Design and Technology, 19(4), 943-65.
Amin, F, Ghazi, M, Sotoodeh, A F and Nikian, M (2021) Economic optimization of heat exchanger networks based on geometric parameters using hybrid genetic-particle swarm algorithm technique. Journal of Engineering, Design and Technology, 19(4), 989-1015.
Ayed Eid, A (2021) Effect of the transversal-spacing of stirrup-legs on the behavior and strength of shallow concealed RC beams. Journal of Engineering, Design and Technology, 19(4), 932-42.
Hamza, H and Alshibani, A (2021) A multi-criteria decision-making model for selecting curtain wall systems in office buildings. Journal of Engineering, Design and Technology, 19(4), 904-31.
Magoda, C M, Gryzagoridis, J and Kant, K (2021) Effective heat conductivity of Honeycomb (porous) composite panel. Journal of Engineering, Design and Technology, 19(4), 876-87.
- Type: Journal Article
- Keywords: heat transfer; performance; vibration; validation; experiment
- ISBN/ISSN:
- URL: http://dx.doi.org/10.1108/JEDT-08-2020-0324
- Abstract:
The purpose of this paper is to validate an assumption of what to use as an effective (steady state) heat transfer coefficient of thermal conductivity for the honeycomb core sandwiched by Fiberglass face sheets composite. A one-dimensional model based on Fourier law is developed. The results are validated experimentally. The results were obtained from the one-dimensional mathematical model of an overall or effective heat conductivity of the Honeycomb composite panel. These results were validated experimentally by applying heat flux on the specimen under controlled environment. The surface temperatures at different voltages were recorded and analysed. The skin of the sandwich composite material used in the investigation was Fiberglass sheet with a thickness of 0.5 mm at the bottom and 1.0 mm at the top surface. Both skins have a stacking sequence of zero degrees. Due to the presence of air cells in the core (Honeycomb), the model considers the conduction, convection and radiation heat transfer, across the thickness of the panel, combined as an effective conduction mode, whose value may be predicted by using the coefficient of thermal conductivity of the air based on the average temperature difference between the two skins. The experimental results for the heat transfer through the thickness of the panel provide validation of this assumption/prediction. Both infrared thermography and conventional temperature measurement techniques (thermocouples) were used to collect the data. The heat transfer experiment and mathematical modeling were conducted. The data obtained were analyzed, and it was found that the effective thermal conductivity was temperature-dependent as expected. The effective thermal conductivity of the honeycomb panel was close to that of air, and its value could be predicted if the panel surface temperatures were known. It was also found that as temperature raised the variation between experimental and predicted effective air conduction raised up. This is because there was an increase in molecular diffusion and vibration. Therefore, the convection heat transfer increased at high temperatures and the air became an insulator. Honeycomb composite panels have excellent physical and thermal properties that influence their performance. This study provides an appropriate method in determining thermal conductivity, which is one of the critical thermal properties of porous composite material. This paper also gives useful and practical data to industries that use or manufacture honeycomb composite panels.
Moniri, M R, Akbar Alem, T, Ayough, A and Zandieh, M (2021) Turnaround project risk assessment using hybrid fuzzy SWARA and EDAS method: case of upstream oil process industries in Iran. Journal of Engineering, Design and Technology, 19(4), 966-88.
Muleya, F, Mulenga, B, Sambo Lyson, Z, Nwaubani, S, Chipozya Kosta, T and Mushota, H (2021) Investigating the suitability and cost-benefit of copper tailings as partial replacement of sand in concrete in Zambia: an exploratory study. Journal of Engineering, Design and Technology, 19(4), 828-49.
Pieters, W D and Tzoneva, R (2021) Investigation of an IEC 61850 standard-based process bus implementation of a protection and control scheme for parallelly connected transformers. Journal of Engineering, Design and Technology, 19(4), 850-75.
Titus, E K, Aigbavboa, C O and Wellington Didibhuku, T (2021) Clusters of key barriers to life cycle assessment adoption in the South African construction industry: perspectives of stakeholders. Journal of Engineering, Design and Technology, 19(4), 888-903.
Umar, M, Michael Ikpi, O, Auwal Sani, A and Abubakar Garba, S (2021) Modelling of mechanical properties of Pa6 based reinforced graphite and graphite nano platelets composites using different aspect ratio. Journal of Engineering, Design and Technology, 19(4), 809-27.