![]() ![]() Solution: Situation: The application is a helium filled balloon of radius r = 1.3 m. When inflated prior to launch, the balloon is spherical (radius 1.3 m) and the inflation pressure equals the local atmospheric pressure. The balloon is inflated at a site where the atmospheric pressure is 0.89 bar and the temperature is 22☌. Estimate the weight (in Newton’s) of the helium inside the balloon. As the balloon ascends, the upward force (buoyant force) will need to exceed the total weight. A team is designing a helium-filled balloon that will fly to an altitude of 80,000 ft. What are the values of its density, specific volume, and specific gravity relative to air weighing 12 N/m3? Solution: Solving for ρg: g g g N m g 9.81 2 3 m s kg g 1.63 3 answer m 16 Solving for υg: g g 1 g 1 kg 1.63 3 m Solving for SGg: SGg 0.613 m3 kg answer g a N 3 SGg m 1.33 answer N 12 3 m 16 Fluid Mechanics Lecture Manual 5 Chapter 2: Properties of Fluids Example 2. A certain gas weighs 16 N/m3 at a certain temperature and pressure. For satisfying the dynamic similarity, the velocity of water (in m/s) is_(Important - Enter only the numerical value in the answer) Correct answer is '22.25'.Chapter 2: Properties of Fluids CHAPTER 2 Fluid Properties Example 1. Water (Kinematic viscosity, νw = 0.89 x 10-6 m2/s) is flowing through a modelpipe of diameter 20 mm. more f 0.5 m diameter withvelocity of 10 m/s. Oil (kinematic viscosity, νoil = 1.0 x 10-5 m2/s) flows through a pipe o.The significant forces areknown to the dependent on structure geometry, fluid velocity, fluiddensity and viscosity, fluid depth and acceleration due to gravity.Choose from the codes given below, which of the following numbers must match for the model with that of the prototype:1. more ely to be exposed for an under water structure, which is likelyto be exposed to strong water currents. A model test is to be conducted for an under water structure which each lik. ![]() ![]() Its kinematic viscosity at 70☌ will be varying approximately Kinematic viscosity of air at 20☌ is given to be 1.6 × 10–.more Its kinematic viscosity at 70☌ will be approximately Kinematic viscosity of air at 20☌ is given to be 1.6 × 10-5m2/s.In summary, the viscosity of water is much higher than the viscosity of air, and this difference has significant implications for fluid mechanics applications. The higher viscosity of water means that more energy is required to move it through a pipe, and this can result in higher pumping costs. For example, a fluid such as water will flow more slowly through a pipe than air, even if the pressure difference driving the flow is the same. This difference in viscosity plays a crucial role in many fluid mechanics applications. This means that water is approximately 55 times more viscous than air. The viscosity of air at standard temperature and pressure (STP) is approximately 0.0000181 Pa.s, while the viscosity of water at STP is approximately 0.001 Pa.s. The viscosity of water with respect to air is about 55 times. Water and air are both fluids with different molecular structures, and hence, they have different viscosities. The viscosity of a fluid is dependent on the fluid's molecular structure and temperature. It is a property of fluids that describes the internal frictional forces that cause a fluid to resist flow. Viscosity is defined as the measure of a fluid's resistance to flow. ![]()
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