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AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES

مجلة النهرين للعلوم الهندسية

ISSN: 25219154 / eISSN 25219162
Publisher: Al-Nahrain University
Faculty: Engineering
Language: Arabic and English

This journal is Open Access

About

Al-Nahrain Journal for Engineering Sciences is a refereed scientific engineering journal published by the College of Engineering, Nahrain University two times per year. The journal publishes the scientific output of researchers from Iraq and abroad in the fields of architectural, chemical, civil, computer, electrical, information technology, laser and optoelectronics, mechanical and medical engineering as well as in related fields. Papers written in Arabic and English are accepted and they are subjected to proper evaluation and accordingly classified as follows:
• Original research papers and papers on novel design, analysis or construction methods of great value to the engineers which include basic and practical results.
• Short communications or short discussions on papers which have already appeared in the journal provided that whose text should not exceed 800 words.

The material of the paper should not violate any intellectual property right of any person or entity and should not contain any subject matter that contravenes any laws and should meet ethical standards applicable to the research discipline.

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Contact info

Editor-in-Chief
College of Engineering Journal
Al-Nahrain University
P.O. Box 64040, Al-Jadyriah
Baghdad-Iraq.
e-mail:jourengnah@gmail.com
m_editor@nahje.com
e_in_cheif@nahje.com
Phone: +964 (0) 7817 202 662

Table of content: 2012 volume:15 issue:2

Article
Effect of Mass Flow Rate on Critical Heat Flux in Vertical Tube

Authors: Muthana L.Abdullah
Pages: 169-177
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Article
The Optimization Conditions of Friction Stir Welding (FSW) for Different Rotational and Weld speeds

Pages: 187-196
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Article
Laser Thermal Input Effects on Deep Penetration CO2 Laser Welding of Carbon Steel

Authors: Saad A. Mohammed Salih
Pages: 222-233
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Article
Fingerprint Identification System Using Neural Networks

Pages: 234-244
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Article
Solar Surgery Optical System Design
تصميمٌ منظومه بصريهٌ للجراحه الشمسيهٌ

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Abstract

The sunlight is suggested to be used in solar surgery as an alternative to the laser surgery. The rays of powerful sunlight are collected, concentrated and transported to the operating theatre from outside through a system of optical fibers in order to use this solar energy in tumor and cancer cell evaporation instead of lasers. The idea of solar surgery is still new and need more practical and design enhancements. This study is a step on this way. A Schmidt Cassegrainien arrangement is suggested for this optical solar system design calculations. It consists of a parabolic dish to concentrate the solar radiation on a secondary flat mirror which directs the light into a fused silica optical fiber cable used to carry the concentrated solar beam from the concentrating system to the operation room.The parabolic reflector dish rim half angle was chosen to be 45o to realize high flux and high efficiency. MATLAB program (version 7.00) has been used to calculate the diameter of the primary parabolic dish, the diameter of the secondary flat mirror and its recession from the fiber tips by two design procedures. The first procedure of these calculations is based on starting with the choice of the optical fiber diameter, while the second design procedure is based on the choosing first the distal end diameter of the optical fiber.The calculations of the second procedure showed more practical results. As the most often used fiber distal diameter in surgery is 0.6mm, then according to calculations the diameter of the primary parabolic dish reflector will be 180mm with a focal length of 108.64mm. The small secondary mirror is perfectly flat of 10.5mm in diameter and its recession from the fiber tip is 5.27mm. Another MATLAB program has been written to find the suitable numerical aperture for the optical fiber of the concentrator system to reach maximum efficiency of the system. It was found to be 0.7 theoretically. The nearest available value of NA for fused silica fiber was 0.66. Fused silica optical fiber of 1mm for core diameter was chosen because of its ability to withstand the high degree of temperature. It is found that this optical system could deliver a flux density as high as 73Wmm-2 for contact surgery and 32Wmm-2 for noncontact surgery.يمٌكن استخدام ضوء الشمس ف الجراحه الشمسيهٌ كاختياٌر اخر بدلا من الجراحه الليزٌريهٌ وذلك بتجميعٌ الطاقه الكبيرٌه في الاشعه الشمسيهٌ وتركيزٌها ونقلها خلال الالياٌف البصريهٌ من الخارج الى داخل صاله العملياٌت لاجل استخدامها فًي عملياٌت استئصال الاورام و تبخيرٌالخلاياٌ السرطانيهٌ بدلا من الليزٌر. أستخدمت طر يقٌه شميتٌ كاساغرينٌ في تصميمٌ هذه المنظومه البصريهٌ للاشعه الشمسيهٌ التي تتكون من الصحن ذو المقطع الدائري الذي يجٌمع الاشعه ويسٌقطها على مراة مستويهٌ لتوجهها الى مدخل ليفٌ بصري مصنوع من السليكٌاالمنصهره لتوصيلٌ هذه الطاقه الشمسيهٌ المركزه الى داخل صاله العملياٌت ,وتم اختياٌر زاويهٌ حافه الصحن لتكون بقيمٌه 54 درجه للحصول على افضل كفائه واعلى طاقه اشعه. استخدمت ف البحث طر قٌت نٌ للتصم مٌ نفذتا على برنامج المصفوفات نوع 0077 لاجراء حسابات قطر الصحن ذو المقطعالدائري وقطر المراة المستو هٌ الثانو هٌ والمسافه المناسبه ب نٌها وب نٌ مدخل الل فٌ البصري.اما الطر قٌه الاولى فتستند الى اجراء حسابات التصم مٌ ابتداء من اخت اٌر قطر الل فٌ البصري ف ح نٌ ان حسابات الطر قٌه الثان هٌ تبداء من اخت اٌر القطر المناسب لطرف الل فٌ من الجهه البع دٌه ألت تخرج منها الاشعه وقد اثبتت الحسابات ان هذه الطر قٌه تعط نتائج عمل هٌ افضل من الطر قٌه الاولى . اظهرت حسابات التصم مٌ ف هذه الحاله ان قطر صحن المقطع الدائري جٌب ان كٌون 087 مللمتر وببعد بؤري ق مٌته 07801 مللمتر وكذلك حددت قطر المراة المستو هٌ بمقدار 0704 مللمتر وبعدها عن الل فٌ البصري 40.0 مللمتر. وللحصول على اعظم كفائه لهذه المنظومه الشمس هٌ تم اعداد برنامج اخر لاجل حساب افضل فتحه عدد هٌ لل فٌ البصري فتم تحد دٌها بق مٌه 700 للحصول على افضل كفائه لهذه المنظومه ولكن بما ان اقرب فتحه عدد هٌ متوفره عمل اٌ لهذا الل فٌ ه 7011 لذلك تم اخت اٌرها ه وقطر الل فٌ البالغ 0 مللمتر لهذا التصم مٌ لضمان تحمل الحراره العال هٌ جراء نقل طاقه شمس هٌ بهذه المنظومه تصل كثافتها الى 07 واط/مللمتر مربعف حاله الجراحه بالاتصال المباشر وكثافه . 7 واط/مللمتر مربع ف حاله الجراحه بالاتصال غ رٌ المباشر.

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