A numerical investigation onlaminar natural convection ofnon-Newtonian fluids in enclosedspaces
Başlık çevirisi mevcut değil.
- Tez No: 714025
- Danışmanlar: PROF. NİLANJAN CHAKRABORTY
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2018
- Dil: İngilizce
- Üniversite: Newcastle Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
Natural convection in enclosed spaces has several applications such as electronic cooling, thermal energy storage systems, solar collectors and heating and preservation of food to name a few. Although natural convection of Newtonian fluids (i.e. fluids like water, air where viscous stress is directly proportional to strain rate) in enclosures has been analysed extensively in the existing literature, relatively limited effort has been directed to the natural convection of non-Newtonian fluids where the strain rate dependence of shear stresses is non-linear in nature. For example, yield stress fluid is a special type of non-Newtonian fluid, which acts as a solid and does not flow until a threshold stress is surpassed. Materials such as mud-slurries in oil drilling, molten chocolate and anti-drip paints are common examples of yield stress fluids. It is possible to modulate the yield stress based on electrical/magnetic field in electro-rheological/magneto-rheological fluids. Thus, it is possible to eliminate (or alter the strength of) convection by applying a magnetic/electric field, which can be useful for mitigating accidental damage in the case of nuclear meltdown and storage of cryogenic materials. Additionally, shear-thinning (shear-thickening) fluids are another special type of non-Newtonian fluid, which show a decrease (increase) in viscosity with increasing shear rate. Many common man-made and biological fluids exhibit shear-thinning (e.g. ketchup and blood) and shear-thickening (e.g. mixtures of corn starch and water; so-called“bulletproof”custard) behaviour. These types of fluids can also be very useful for designing new adaptive thermal management systems (e.g. cooling of electronics, solar and nuclear power systems, etc.). Therefore, this thesis focuses on fundamental physical understanding and modelling of steady-state laminar natural convection of non-Newtonian fluids in enclosures using numerical simulations. A detailed parametric analysis has been
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