EFFECT OF HOT PRESSING ON THE INTERNAL MAT ENVIRONMENT
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EFFECT OF HOT PRESSING ON THE INTERNAL MAT ENVIRONMENT
| Author: | Osama Mohammed Elmardi دكتور أسامة محمد المرضي سليمان خيال |
| Category: | Mechanical Engineering [Edit] |
| Language: | English |
| Pages: | 41 |
| File Size: | 2.67 MB |
| Extension: | |
| Creation Date: | 06 Aug 2019 |
| Rank: | 476,695 No 1 most popular |
| Short link: | Copy |
| More books like this book | |
Osama Mohammed Elmardi
associate professor
The Publisher and the author
Book EFFECT OF HOT PRESSING ON THE INTERNAL MAT ENVIRONMENT .
دكتور مهندس أسامة محمد المرضي سليمان وُلِدَ بمدينة عطبرة بالسودان في العام 1966م. حاز على دبلوم هندسة ميكانيكية من كلية الهندسة الميكانيكية – عطبرة في العام 1990م. تحصَّل أيضاً على درجة البكالوريوس في الهندسة الميكانيكية من جامعة السودان للعلوم والتكنولوجيا – الخرطوم في العام 1998م ، كما حاز على درجة الماجستير في تخصص ميكانيكا المواد من جامعة وادي النيل – عطبرة في العام 2003م ودرجة الدكتوراه من جامعة وادي النيل في العام 2017م. قام بالتدريس في العديد من الجامعات داخل السودان، بالإضافة لتأليفه لأكثر من ثلاثين كتاباً باللغة العربية ولعشرة كتب باللغة الإنجليزية بالإضافة لخمسين ورقة علمية منشورة في دور نشر ومجلات عالمية إلى جانب إشرافه على أكثر من ثلاثمائة بحث تخرج لكل من طلاب الماجستير، الدبلوم العالي، البكالوريوس، والدبلوم العام. يشغِل الآن وظيفة أستاذ مساعد بقسم الميكانيكا بكلية الهندسة والتقنية - جامعة وادي النيل. بالإضافة لعمله كاستشاري لبعض الورش الهندسية بالمنطقة الصناعية عطبرة. هذا بجانب عمله كمدير فني لمجموعة ورش الكمالي الهندسية لخراطة أعمدة المرافق واسطوانات السيارات والخراطة العامة وكبس خراطيش الهيدروليك.
Book Description
The effect of several hot pressing parameters on the internal mat environment was
investigated by using the mathematical model and the results were compared to data collected experimentally. The different pressing parameters included three initial mat moisture contents (5, 8.5, 12 %), three final panel densities (609, 641, 673 kg/m3 or 38, 40, 42 lb/ft3), two press platen temperatures (150, 200 °C), and three press closing times (40, 60, 80 s). The variation of temperature and total gas pressure during the press cycle at six points in the vertical mid-plane of a single layer, random mat structure was predicted with the heat and mass transfer model using the different pressing conditions. Twenty-four boards were manufactured according to the same
specifications, and the temperature and internal gas pressure were measured with thermocouples and gas pressure probes at the same six locations. The model predicted data described the major trends during the hot-compression operation qualitatively. However, further work is needed to make quantitative predictions.
A hot-compression model was developed based on fundamental engineering principles. The material physical and transport properties were the best available values from the literature or best estimates based on engineering judgment. A sensitivity study assessed the relative importance of the different transport properties during the hot-compression process. The response of selected variables of the hot-compression model for a perturbation of the parameter values was investigated. The sensitivity analysis of the model parameters revealed
that the thermal conductivity and gas permeability of the mat have the greatest influence on model results. The assessment of these transport properties experimentally, as a function of mat structure, is highly desirable and can considerably improve the model predictions.
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