Performance comparison of different microfine tubes during flow boiling of azeotropic refrigerants
Başlık çevirisi mevcut değil.
- Tez No: 797100
- Danışmanlar: PROF. LUCCHİNİ ANDREA, PROF. COLOMBO LUİGİ PİETRO MARİA
- Tez Türü: Yüksek Lisans
- Konular: Kimya, Kimya Mühendisliği, Chemistry, Chemical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Politecnico di Milano
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 146
Özet
Özet yok.
Özet (Çeviri)
The purpose of this thesis is to get familiar with the two-phase flow theory, heat transfer coefficient and frictional pressure drop per unit length in the process of flow boiling in horizontal tubes by using the experimental data which is obtained in the labs of the Energy Department of Politecnico di Milano. It also focuses on the behavior on the microfine. In this sense, smooth tube and four different types of microfine tubes are taken into consideration. The microfine tubes are named as Tube V, Tube W, Tube VA and Tube HVA. Each have their own unique fin type and fin alignment. Nowadays, two-phase vapor-liquid flows are commonly encountered in many industrial and engineering applications such as heat exchangers, oil and gas exploitation, refrigeration and air conditioning systems, environmental control and life support systems and pipeline network systems. Therefore, the behavior of fluids in terms of heat transfer coefficient and pressure drop have a significant importance. In this respect, many correlations have been proposed throughout the history both for heat transfer coefficient and pressure drop. In the process of theoretical calculation, Kandlikar, Shah, Fang, Saitoh, Gungor & Winterton models are used for heat transfer coefficient while Muller-Steinhagen and Heck, Gronnerud, Friedel, Chen, Tran and Haraguchi methods are used for frictional pressure drop per unit length. After the frictional pressure drop per unit length is calculated, the behavior of both heat transfer coefficient and frictional pressure drop per unit length are considered as a function of mass flux and mean quality. As it can be seen later in this thesis, they provide a linear increase with increasing mass flux and mean quality. An error band of ∓ 30 % is checked for each method by using mean absolute relative deviation (MARD) and mean relative deviation (MRD). Then the results of experimental and theoretical values are compared by using parity plots for each type of tube. Process is repeated for each method mentioned above. By making this comparison, the best method for each type of microfine tube is obtained both for heat transfer coefficient and pressure drop per unit length. All of these methods are proposed by using their own set of data. In other saying, they are mostly valid for a specific data set. That is why each microfine tube has a different method that represents the best result. K E Y W O R D S : Two-Phase Flow, Boiling, Microfine Tubes, Heat Transfer Coefficient, Kandlikar, Shah, Fang, Saitoh, Gungor & Winterton, Frictional Pressure Drop, Muller-Steinhagen and Heck, Gronnerud, Friedel, Chen, Tran, Haraguchi
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