(यह छवि केवल उदाहरण के लिए बनाई गई है)
A non-Newtonian fluid is one whose श्यानता changes under an applied अपरूपण तनाव. Unlike a Newtonian fluid where viscosity is constant, its flow properties are not described by a linear relationship between shear तनाव ([latex]\tau[/latex]) and shear rate ([latex]\dot{\gamma}[/latex]). This dependency can manifest as शिअर थिनिंग (viscosity decreases with stress) or कतरनी-मोटाई (viscosity increases with stress).
The fundamental difference between Newtonian and non-Newtonian fluids lies in their response to shear. For a Newtonian fluid, the relationship is linear, defined by Newton’s law of viscosity: [latex]tau = mu dot{gamma}[/latex], where [latex]mu[/latex] is the constant coefficient of viscosity. For non-Newtonian fluids, this relationship is non-linear and can be time-dependent. The apparent viscosity, defined as [latex]eta = tau / dot{gamma}[/latex], is not a constant but a function of the shear rate itself, [latex]eta(dot{gamma})[/latex].
This behavior arises from the fluid’s internal microstructure, such as long polymer chains, suspended particles, or emulsions. When a shear force is applied, these microstructures can align, deform, or rearrange, altering the fluid’s resistance to flow. For example, in a polymer solution (a shear-thinning fluid), the randomly coiled polymer chains untangle and align with the flow direction under high shear, reducing internal friction and thus viscosity. Conversely, in a concentrated suspension like cornstarch in water (a shear-thickening fluid), the particles may jam together under high shear, drastically increasing viscosity.
The study of these complex flow behaviors is called rheology. Understanding a fluid’s non-Newtonian properties is critical in many industrial processes, from pumping and mixing to coating and molding, as the processing conditions directly influence the material’s behavior.
बॉट ट्रैफिक को कम करने के कारण, जो वर्तमान में प्रति दिन 40,000 से अधिक है, यह सामग्री केवल समुदाय के सदस्यों के लिए आरक्षित है।
> लॉगिन < या > रजिस्टर < इस सामग्री और अन्य सभी प्रतिबंधित सामग्रियों और उपकरणों तक पहुंच (100% निःशुल्क) है।
गैर-न्यूटनियन द्रव की परिभाषा
(यदि तिथि अज्ञात है या प्रासंगिक नहीं है, उदाहरण के लिए "द्रव यांत्रिकी", तो इसके उल्लेखनीय उद्भव का एक अनुमानित आंकड़ा प्रदान किया गया है)
पंजीकृत सदस्यों के लिए पूर्ण आकार की छवियाँ और डाउनलोड 100% निःशुल्क उपलब्ध हैं।
> लॉग इन करें <
