Date of Defense
24-3-2025 1:00 PM
Location
F1-1043
Document Type
Thesis Defense
Degree Name
Master of Science in Mechanical Engineering (MSME)
College
COE
Department
Mechanical and Aerospace Engineering
First Advisor
Prof. Mohamed Younes E Selim
Abstract
Engine cooling is considered one of the most important factors that affect their efficiency and therefore their performance, so a new cooling method is proposed using both heat pipes and fins to improve the cooling quality of internal combustion engines and shall be examined theoretically and experimentally. A test rig has been designed and built using a specimen material with similar properties to the real engine materials with similar dimensions as the engine cylinder head / liner thickness. In order to make the effectiveness of this research, a comparison between the cooling by fins alone and cooling the engine by fins built-in heat pipes (heat pipe manufactured inside the fins) shall be carried out. The heat pipes are filled by proper liquid – depends on selected thermal property- so that when it evaporates (evaporator section), then moves away to the condenser section as it condenses so that it removes the heat from the engine to the surrounding air. The objective is to increase the heat flux that the specimen (or the engine cylinder head) can undertake without being over heated. This will enable the engine to produce more power without material-thermal failure. Measurements included the surface and internal temperatures of specimen material, cooling air temperatures and the heat flux from the engine specimen. Numerical simulation by ANSYS software to correlate between cooling flow conditions, geometry of fins and heat flux have been estimated. The possibility and feasibility of using the heat pipes to cool the engine have examined and presented.
INVESTIGATION OF INNOVATIVE HEAT PIPES / FINS SYSTEM FOR DIESEL ENGINE COOLING
F1-1043
Engine cooling is considered one of the most important factors that affect their efficiency and therefore their performance, so a new cooling method is proposed using both heat pipes and fins to improve the cooling quality of internal combustion engines and shall be examined theoretically and experimentally. A test rig has been designed and built using a specimen material with similar properties to the real engine materials with similar dimensions as the engine cylinder head / liner thickness. In order to make the effectiveness of this research, a comparison between the cooling by fins alone and cooling the engine by fins built-in heat pipes (heat pipe manufactured inside the fins) shall be carried out. The heat pipes are filled by proper liquid – depends on selected thermal property- so that when it evaporates (evaporator section), then moves away to the condenser section as it condenses so that it removes the heat from the engine to the surrounding air. The objective is to increase the heat flux that the specimen (or the engine cylinder head) can undertake without being over heated. This will enable the engine to produce more power without material-thermal failure. Measurements included the surface and internal temperatures of specimen material, cooling air temperatures and the heat flux from the engine specimen. Numerical simulation by ANSYS software to correlate between cooling flow conditions, geometry of fins and heat flux have been estimated. The possibility and feasibility of using the heat pipes to cool the engine have examined and presented.
Comments
تهتم هذه الأطروحة بدراس ة وبحث استخدام طريقة جديدة للتبريد باستخدام كل من الأنابيب الحرارية والزعانف لتحسين نوعية التبريد لمحرك الاحتراق الداخلي، ويجب فحصها نظريا وتجريبيا . تُبنى منصة اختبار باستخدام مادة عينة لها خصائص مماثلة لمواد المحرك الحقيقية ذات أبعاد مماثلة لسمك رأس أسطوانة المحرك .
وبغية تحقيق فعالية هذا البحث، تجري مقارنة بين التبريد بالزعانف وحدها وتبريد المحرك بواسطة أنابيب حرارية مدمجة بالزعانف (مصنعة داخل الزعانف).
تم ملء الأنابيب الحرارية بسائل مناسب - يعتمد على خاصية حرارية مختارة - بحيث عندما يتبخر (قسم المبخر)؛ ينتقل بعي دا إلى قسم المكثف أثناء تكثيفه بحيث يزيل الحرارة من المحرك إلى الهواء المحيط، والمتوقع هو زيادة التدفق الحراري (بدرجة حرارة السطح نفسها) حيث يجب زيادة طريقة التوصيل والحمل الحراري لنقل الحرارة (في حالة الزعانف) عن طريق تبخر السائل داخل الزعانف - أنابيب الحرارة - وهو أكثر بكثير من توصيل الزعانف النقية (الحالة الأولى) بعدة مرات. وتشمل القياسات درجات الحرارة السطحية والداخلية لمواد العينات، ودرجات حرارة الهواء الباردة، وتدفق الحرارة من المحرك.
للترابط بين ظروف تدفق التبريد وهندسة الزعانف وتدفق الحرارة، وتطرح إمكانية ANSYS تقدر المحاكاة العددية بواسطة برنامج وجدوى استخدام أنابيب الحرارة لتبريد المحرك.