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    Fluid Mechanics

    Fluid dynamics is the study of fluid flow. It has two subdisiciplines, aerodynamics and hydrodynamics. Fluid dynamics is used in a wide range of applications. One can calculate the forces on aircrafts, determine flow through pipes or predict weather patterns by using fluid dynamics. Some principles from fluid dynamics are even used in traffic engineering. Fluid dynamics is cross disciplinary and studied in a wide variety of ways.
    The foundation of fluid dynamics is the conservation laws. These laws are based off classical mechanics but modified in quantum mechanics and general relativity. From these principles the Reynolds Transport Theorem was created. To model more complex equations of Newtonian fluids, physicists use the Navier-Stokes equations which model the behavior of fluids in a series of differential equations. Computational physics is often used in order to solve these complex problems in which stress and velocity are dependent on linearity.

    Compressible Fluid – The density changes with a change in pressure or temperature.
    Incompressible Fluid – The density change is negligible with a change in pressure or temperature.
    Viscous Flow – The fluid friction does not have significant effects on the fluid motion. Viscous flow indicated the Reynolds number is low.
    Inviscid Flow – The fluid Friction has significant effects on fluid motion. The Reynolds number is high.
    Steady Flow – The fluid properties throughout the system do not change.
    Unsteady Flow – The fluid properties change through the system.
    Laminar Flow – The fluid flow is in parallel layers with no disruptions. The Reynolds number is less than one.
    Turbulent Flow – There is recirculation and apparent randomness of flow. The Reynolds number is greater than one.
    Newtonian Fluid – The viscous stresses arise from the flow at every point. These stresses are proportional to the local strain rate over time.
    Non-Newtonian Fluid – The viscosity of the fluid is dependent on shear rate.

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    BrainMass Categories within Fluid Mechanics


    Solutions: 14

    The study of air and other gases in motion.

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    The Physics of Pressure Washers

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    Fluid Mechanics: Airplane Wing Design

    One of the most important applications of fluid dynamics is in the design of airplane wings. In this SLP, we'll introduce some basic terminology and take a quick look at the relationship between angle of attack, airspeed, and lift. Go to the NASA GRC (2010) link on the Background page, which is a simulation called FoilSimII

    Fluid Mechanics: Static and Dynamic Pressures

    1. A laboratory receives a sample of a metallic alloy composed of aluminum and magnesium. The sample is a solid cylinder with a diameter of 2 cm and a length of 5 cm. Its mass is 15.70 g. What is its density? What is its specific gravity? 2. A boat has a dry weight of 3500 lbs. How many liters of water does it displace?

    Fluid Dynamics Pressure Studies: Pressurized Tank Underwater

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    Better Formula for Fluid Mechanics Problem

    An open channel having a rectangular cross section is laid so that the rate of grade is 0.00048. The width of the channel is 10.00 ft, and the value of n in Kutter's formula may be taken as 0.011. When the depth of the water in the channel is 4.00 ft, the velocity computed by the Chezy formula is?

    Condition for Irrotationality of a 2-d Ideal Fluid Flow

    See the attached file. Working from first principles show that the condition for irrotationality of a two-dimensional ideal fluid flow is given by: delta(u)/delta(y) = delta(v)/delta(x) Hence, define in mathematical terms the velocity potential psi, and show that potential lines of constant psi are perpendicular to st

    Magnitude and Direction of Shearing Stress

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    Fluid Mechanics, Moment of Inertia

    A symmetrical trapezoidal plate has the following dimensions: the widths of the parallel sides are, respectively, 2.50 ft and 4.50 ft; the perpendicular distance between those sides is 1.50 ft. the plate is submerged in a liquid in a vertical position with the parallel sides horizontal and the shorter parallel side at the top an

    Schwarzschild Radius

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    Blood flow in an artery

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    A technician is using a laser which is classed '3B'

    6. A technician is using a laser which is classed '3B (Restricted)' within the guidelines of Australian Standard AS2211.1-1997 a) What is the maximum radiant exposure the technician could receive in the 0.20s it takes to blink? b) If the MPE for the technician is 6mJm-2, what optical density would be appropriate for the gla

    Fluid Dynamics and Drag Forces

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    Mechanical and Materials Engineering - Fluid Mechanics

    Attached is a diagram of an oil storage drum that is open to the atmosphere at the top. Some water was accidentally pumped into the tank and settled to the bottom as shown in the picture. Find the depth of the water h2 if the pressure gage at the bottom reads 158kPa(gage). The total depth hT= 18.0m.

    Find the viscosity of the oil.

    In a falling-ball viscometer, a steel ball 1.6mm in diameter is allowed to fall freely in a heavy fuel oil having a specific gravity of 0.94. Steel weighs 77kN/m^3. If the ball is observed to fall 250mm in 10.4s, find the viscosity of the oil.

    Apparent Weight and Actual Weight

    Please help with the given problem: ** Please see the attached file for the figure depicting the described problem ** You must compute the ratio of the actual weight of the crown (W_actual) and the apparent weight of the crown when it is submerged in water (W_apparent). See whether you can follow in Archimedes' footsteps. Th

    Mechanical Engineering Design

    1 The carbon dioxide in a nuclear reactor is maintained at 40 bar (gauge) and 70 deg C. Estimate its density, specific weight and relative density. 2 A water-filled manometer indicates a pressure differential of 2100 N/m2. What is the difference in elevation of the vertical limbs?

    Density and Radius of a Fuel Line

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    Enthalpy calculation

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    Oscillator response function

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    Proposal for airline mechanics

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    A deformed hollow cylinder.

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    Problems on Fluid Dynamics

    Two problems on fluid dynamics: Problem 1: Water flowing in a pipe with two sections with different cross section areas. To determine pressure, velocity and flow rates in the two sections. Problem 2: Water in a tank being siphoned off. To determine velocity, pressure, flow rate etc.. See the attached file.