ANALYSIS OF THE TWO PHASE FLOW PRESSURE DROP TYPE OSCILLATIONS IN A WATER BOILING HORIZONTAL STRAIGHT TUBE

Year 2018, , 324 - 334, 31.01.2018

Şendoğan Karagöz Mehmet Yılmaz Gökhan Ömeroğlu

https://doi.org/10.28948/ngumuh.387071

Abstract

   Two phase
flows occur in many industrial applications such as refrigeration systems,
turbo machinery, and power plant heat exchangers. Prediction of flow parameters
is very crucial in design of two-phase flow equipment. Oscillations incurred by
instabilities in two-phase flow systems cause mechanical vibrations, boiling
crisis, high transient temperatures, control problems and even burnout at wall
surface. This study is focused on determining steady state characteristic
curves for certain inlet temperature and exit restriction conditions at
different mass flow rates and compares variation of pressure drop type dynamic
two phase flow instabilities in horizontal tube system. This work aims to
predict low frequency pressure drop type oscillations in an in-tube boiling
system. Results provide further understanding of mechanism of
pressure-drop-type instabilities in a horizontal boiling tube system. They can
also be utilized as guidance for design and control strategy of systems to
avoid serious oscillation problems. 

Keywords

Two phase flow instabilities, pressure drop type instabilities, density wave type instabilities, stability boundary, inlet sub-cooling

SU KAYNAMALI YATAY DÜZ BORUDA İKİ FAZLI AKIŞ BASINÇ DÜŞÜMÜ OSİLASYONLARININ ANALİZİ

Abstract

   İki fazlı akışlar, soğutma sistemleri, turbo makineler ve enerji
santrallerindeki ısı eşanjörleri gibi birçok endüstriyel uygulamada ortaya
çıkar. İki fazlı akış ekipmanlarının tasarımında akış parametrelerinin tahmini
çok önemlidir. İki fazlı akış sistemlerinde kararsızlıklardan kaynaklanan
salınımlar mekanik titreşimlere, kaynama krizine, yüksek geçiş sıcaklıklarına,
kontrol problemlerine ve hatta cidarda ani sıcaklık yükselmesine neden olur. Bu
çalışma, belirli giriş sıcaklığı ve çıkış kısıtlaması şartlarında değişik
debilerde kararlı hal karakteristik eğrilerini belirleme üzerine odaklanmıştır
ve yatay borulu sistemdeki basınç düşümü tipi iki fazlı akış dinamik
kararsızlıklarının değişimlerini karşılaştırmaktadır. Bu çalışma, borulu
kaynama sisteminde düşük frekanslı salınımları öngörmeyi amaçlamaktadır.
Sonuçlar, yatay kaynamalı boru sisteminde basınç düşümü tipi kararsızlık
mekanizmasının daha iyi anlaşılmasını sağlar. Ayrıca, ciddi salınım
problemlerinden kaçınmak için sistemlerin tasarım ve kontrol stratejileri için
kılavuz olarak da kullanılabilirler.

Keywords

İki fazlı akım istikrarsızlıkları, basınç düşüşü tipi istikrarsızlıklar, yoğunluk dalga tipi istikrarsızlıklar, stabilite sınırı, giriş aşırı soğutma

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