پایان نامه بررسی عددی تأثیر ابعاد هندسی نازل های تزریق جهت افزایش عملکرد سرمایشی دستگاه ورتکس تیوب

فهرست:

1-1 رانکیو-هیلش ورتکس تیوب                                                                           1

      1-2 تحقیقات رانکیو                                                                                    2

      1-3 تحقیقات هیلش                                                                                   3

      1-4 ورتکس تیوب مخروطی یا واگرا                                                                  4

      1-5 ساختار کلی دستگاه                                                                              5

      1-6 مزایا و معایب ورتکس تیوب                                                                      6

           1-6-1 مزیت­های عمده ورتکس تیوب                                                          6

           1-6-2 برخی معایب ورتکس تیوب                                                             7

      1-7 ورتکس تیوب­های تجاری                                                                         7

      1-8 کاربردهای ورتکس تیوب                                                                         7

            1-8-1 خنک کاری موضعی                                                                     7

           1-8-2 گرمایش موضعی                                                                         8

           1-8-3 خنک کننده هوای شخصی                                                             9

           1-8-4 کاربرد به عنوان یک سیستم جدا کننده رسوب                                      9

           1-8-5 کاربرد به عنوان یک سیستم پالاینده در صنایع نفت و گاز                           9

           1-8-6 کاربرد در جوشکاری اولتراسونیک                                                     10

      1-9 کارهای آزمایشگاهی                                                                             10

      1-10 ساختار کلی پایان نامه                                                                         11

فصل دوم: مروری بر کارهای گذشته

      2-1 تحقیقات آزمایشگاهی بر روی ورتکس تیوب                                                  13

           2-1-1 پارامترهای ترموفیزیکی                                                                 13

           2-1-2 پارامترهای هندسی                                                                     14

      2-2 تحقیقات تئوری بر روی ورتکس تیوب                                                         15

           2-2-1 مدل تراکم و انبساط آدیاباتیک                                                        15

           2-2-2 اثر اصطکاک و توربولانس                                                              15

           2-2-3 مدل جریان آکوستیک                                                                  16

           2-2-4 مدل چرخش ثانویه                                                                     17

      2-3 تحقیقات عددی بر روی ورتکس تیوب                                                         19

           2-3-1 محل نقاط سکونی طولی و شعاعی داخل ورتکس تیوب                             19

      2-4 بررسی نازل­های تزریق دستگاه                                                                 20

           2-4-1 تحقیقات آزمایشگاهی بر روی نازل­های تزریق دستگاه ورتکس تیوب              21

           2-5-2 مطالعات عددی بر روی نازل­های تزریق دستگاه ورتکس تیوب                     22

فصل سوم: تجزیه و تحلیل نظری ورتکس تیوب

      3-1 بررسی ترمودینامیکی ورتکس تیوب                                                            24

           3-1-1 قانون اول ترمودینامیک                                                                 26

           3-1-2 قانون دوم ترمودینامیک                                                                 26

      3-2 مدل چرخش ثانویه آلبرن                                                                       29

           3-2-1 مدل چرخش ثانویه آلبرن (مدل مبدل حرارتی)                                     29

           3-2-2 مدل اصلی چرخش ثانویه آلبرن                                                       31

           3-2-3 تفسیر مدل آلبرن                                                                       32

           3-2-4 مدل آلبرن اصلاح شده                                                                 33

فصل چهارم: مدل عددی بررسی شده                                                                      

      4-1 شبیه سازی عددی ورتکس تیوب                                                              38

           4-1-1 معادلات حاکم                                                                           38

           4-1-2 مدل­سازی توربولانس                                                                   39

      4-2 توصیف هندسی ورتکس تیوب مدل شده                                                     41

      4-3 شرایط مرزی                                                                                     42

           4-3-1 ورودی (Inlet)                                                                          42

           4-3-2 خروجی سرد (Cold Exit End)                                                   43

           4-3-3 خروجی گرم (Hot Exit End)                                                     43

              4-3-4 دیواره ورتکس تیوب (Wall)                                                          43

      4-4 اهداف و دورنمای بررسی و تحقیق عددی                                                     43

      4-5 بررسی استقلال نتایج عددی از مش بندی                                                    44

      4-6 بررسی مدل توربولانس                                                                          45

      4-7 مقایسه نتایج عددی با تجربی و اعتباردهی به نتایج عددی                                  46

      4-8 بررسی قانون دوم ترمودینامیک برای ورتکس تیوب                                          47

فصل پنجم: بررسی تأثیر ابعاد نازلهای تزریق بر عملکرد دستگاه ورتکس تیوب

5-1

بررسی تأثیر ارتفاع نازل بر دمای خروجی سرد و گرم دستگاه

49

5-2

مفهوم جریان برگشتی در ورتکس تیوب

53

5-3

بررسی عدد ماخ داخل محفظه چرخش در حالات مختلف ارتفاع نازل

54

5-4

بررسی تناظر بین فشار در محفظه چرخش و دمای خروجی سرد دستگاه

55

5-5

بررسی تأثیر سطح مقطع مستطیلی ورودی نازل بر روی جدایش دمایی سرد دستگاه

58

5-6

توزیع دما و خطوط مسیر

60

5-7

بررسی مولفه چرخشی سرعت و ماکزیمم مقدار آن

61

5-8

نرخ توان سرمایشی و گرمایشی

62

5-9

تحلیل عدد ماخ و فشار کل در مدل حالت بهینه و اسکای و همکاران[66]

63

فصل ششم: نتایج و پیشنهادات

6-1 خلاصه نتایج                                                                                       66

6-2 پیشنهاد برای کارهای آتی                                                                        68

فهرست منابع و مأخذ                                                                                        69

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