Experimental investigations in circular tube to enhance turbulent heat transfer using various types of twisted tape inserts
Other Title(s)
دراسة عملية لخصائص انتقال لحرارة و الكفاءة لجريان الهواء المضطرب خلال انبوب دائري مجهز بأنواع مختلفة من الأشرطة الملتوية
Joint Authors
Muhammad, Aqil Abd Allah
Jadoaa, Amir A.
Source
Engineering and Technology Journal
Issue
Vol. 29, Issue 14 (31 Dec. 2011), pp.2961-2973, 13 p.
Publisher
Publication Date
2011-12-31
Country of Publication
Iraq
No. of Pages
13
Main Subjects
Topics
Abstract AR
يبين العمل الحالي النتائج التي تم الحصول عليها من الدراسة العملية لتحصيل انتقال الحرارة لجريان مضطرب بأنبوب أفقي بواسطة حشر شريط ملتو.
ستة أنواع من الأشرطة الملتوية أستخدمت للتجريب بطول كلي مقداره 1200ملم و بقطر 50 ملم كما يلي : شريط ملتو اعتيادي، أشرطة ملتوية تفصلها مسافة منتظمة، شريط ملتو ذو قطع مثلث، شريط ملتو ذو قطع مستطيل، شريط ملتو ذو قطع نصف دائري، و شريط ملتو مثقب.
يتمد رقم رينولدز من 4500 إلى 23500 أستنبطت علاقات تجريبية من النتائج الحاصلة لرقم نسلت، عامل الاحتكاك، و كفاءة التحسين لكل نوع من أنواع حشر الشريط الملتوي.
لوحظ أن كفاءة انتقال الحراراة تزداد كلما تغير نوع الشريط الملتوي من الأول إلى السادس على التوالي.
Abstract EN
This paper reports on diagnostic parameters for pedestrian traffic safety problems using the Traffic Conflict Analysis Technique (TCT), particularly for pedestrian crossings at urban unsignalized intersections.
The method of study is based on the U.S.
FHWA-Federal Highway Administration guides for vehicular and pedestrian conflicts, applied using data collected from pedestrian crossings of several types observed in 4 critical unsignalized intersections in Baghdad city all of them located on the CBD area and experiencing high vehicular and high pedestrians volumes.
Regression analyses is performed to relate hourly pedestrian conflict to (hourly traffic conflict, hourly pedestrian volume, average pedestrian walking speed) as well as hourly pedestrian conflict / approach to (average spot speed, average pedestrian delay and approach width).
HCM 2000 manual is adopt to determine the average pedestrian delay.
Specific categories of countermeasures in geometric characteristics are suggested to improve pedestrian safety.
A developed model shows that, an extra increase of hourly pedestrian conflict can be represented by positive exponential model trend in relation with hourly pedestrian volume, hourly traffic volume, average spot speed and average pedestrian delay with coefficient of correlation range between 0.824–0.949, as well as a developed model shows that, an extra decrease of pedestrian conflict can be represented by negative exponential model trend in relation with average pedestrian walking speed with coefficient of correlation 0.921, on the other hand, it is found that, an increase of pedestrian conflict can be represented by positive linear model trend in relation with approach width with coefficient of correlation 0.837.In addition it is found that the higher coefficient of correlation 0.943 well get it when pedestrian conflict related with the hourly pedestrian volume and average pedestrian delay convened from all studied parameters (average spot speed, approach width, hourly traffic volume, average walking speed, average pedestrian delay and exit stop line).
American Psychological Association (APA)
Muhammad, Aqil Abd Allah& Jadoaa, Amir A.. 2011. Experimental investigations in circular tube to enhance turbulent heat transfer using various types of twisted tape inserts. Engineering and Technology Journal،Vol. 29, no. 14, pp.2961-2973.
https://search.emarefa.net/detail/BIM-289802
Modern Language Association (MLA)
Muhammad, Aqil Abd Allah& Jadoaa, Amir A.. Experimental investigations in circular tube to enhance turbulent heat transfer using various types of twisted tape inserts. Engineering and Technology Journal Vol. 29, no. 14 (2011), pp.2961-2973.
https://search.emarefa.net/detail/BIM-289802
American Medical Association (AMA)
Muhammad, Aqil Abd Allah& Jadoaa, Amir A.. Experimental investigations in circular tube to enhance turbulent heat transfer using various types of twisted tape inserts. Engineering and Technology Journal. 2011. Vol. 29, no. 14, pp.2961-2973.
https://search.emarefa.net/detail/BIM-289802
Data Type
Journal Articles
Language
English
Notes
Includes appendices : p. 2968-2973
Record ID
BIM-289802