Fluid Kinematics , tailored for competitive exams like SSC JE , HPCL , and other PSUs —along with relevant previous year questions (PYQs) and their explanations. 💧 Fluid Kinematics – ✅ What is Fluid Kinematics? Fluid kinematics is the study of fluid motion without considering the forces or energy that cause the motion. It focuses only on velocity, acceleration, and flow description using streamlines, pathlines, etc. 📘 Key Concepts in Fluid Kinematics 1. Types of Flow Flow Type Description Steady Flow Flow properties (velocity, pressure) do not change with time Unsteady Flow Flow properties vary with time Uniform Flow Properties are the same at every point in space Non-Uniform Flow Properties vary from point to point Laminar Flow Streamlined, orderly layers (Re < 2000) Turbulent Flow Random, chaotic flow (Re > 4000) Compressible Flow Density changes (gases) Incompressible Flow Density constant (liquids) 2. Flow Descripto...
Dimensionless Numbers – a vital concept in fluid mechanics , heat transfer , and engineering modeling , especially important for competitive exams like SSC JE , RRB JE , GATE , IES , and various PSUs . 🔢 What Are Dimensionless Numbers? Dimensionless numbers are ratios of quantities that have no physical units. They help compare different physical effects and are essential for modeling, analysis, and similarity in engineering problems. They often arise from the non-dimensionalization of governing equations (like Navier-Stokes or energy equations) and reveal dominant physical forces in a system. 📦 Why Are They Important? Help simplify complex problems Used in model testing (e.g., wind tunnel, hydraulic models) Allow scaling from model to prototype Help determine regimes : laminar vs. turbulent, conduction vs. convection, etc. Appear in correlation equations (e.g., heat transfer coefficients) 📘 Common Dimensionless Numbers (With Physical Me...