FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Through a refinery, fuel ethanol is flowing in a
pipe at a velocity of 1.2 m/s and pressure of
1.8 bar. The refinery needs the ethanol to be
at a pressure of 2.8 bar on a lower level. Find
the difference in height in order to achieve
this pressure? Assume the velocity does not
change. (Hint: The density of ethanol is 789
kg/m3 and gravity g is 9.8 m/s².)
the difference in height in m of water
Water accelerated by a nozzle to 35 m/s strikes the verticalback surface of a cart moving horizontally at a constant velocity of 10 m/s in the flow direction as shown in Fig. Q5.The mass flow rate of water through the stationary nozzle is 30 kg/s. After the strike, the water stream splatters off in all direction in the plane of the back surface.
(i) State Newton’s second law of motion and determine theforce that needs to be applied by the brakes of the cart toprevent it from accelerating.
(ii) If the force were used to generate power instead of wasting it on the brakes, determine the maximum amount of power that could ideally be generated.
(iii) If the mass of the cart is 400 kg and the brakes fail,determine the acceleration of the cart when the water firststrikes it. Assume the mass of water that wet the back surface is negligible
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- (a) A substance flows through a turbine at the rate of 100 lb./min with ΔKE = 0 and Q = 0. At entry, its pressure is 175 psia, its volume is 3.16 ft.3/lb., and its internal energy is 1166.7 BTU/lb. At exit, its pressure is 0.813 psia, its volume is 328 ft.3/lb., and its internal energy is 854.6 BTU/lb. What horsepower is developed? (b) The same as (a) except that the heat loss from the turbine is 10 BTU/lb. of steam.arrow_forwardA fluid moves in a steady flow manner between two sections in a flow line. At section 1, the area is 10 ft^2, velocity is 100 fpm, specific volume is 4 ft^3/lb. At section 2, the area is 2 ft^2, and the density is 0.2 lb/ft^3. Calculate (a) the mass flow rate at section 2. Calculate (b) the speed at section 2.arrow_forwardA centrifugal pump has the following characteristics as shown in Table 1. Table 1: Pump characteristics Q(m3 /s) 0.033 0.029 0.027 0.0235 0.020 0.017 0.0133 H(m) 40 60 66 75 80 84 90 Efficiency % 20 45 55 68 75 66 45 The pump is used to pump water from a low reservoir to a high reservoir through a total length of 1100 m of pipe 250 mm in diameter. The difference between the water levels in the reservoirs is 25 m. Neglecting all losses except friction and assuming λ=0.042, calculate: i. The discharge and head at the duty point for the pump. (20) ii. The efficiency at the duty point. (5) [2arrow_forward
- Water flows at steady state. It is siphoned from an open container as shown below. The height of the water from the ground is 18.6 feet while the height of point 3 from the ground is 4.2 feet. The atmospheric pressure is 14.7 psia. Determine the velocity at point 2. Assume that the velocity in the tank is 0 since it is very large and the pressure at point 3 is 0 since it is a free jet. Round your answers to 1 decimal place only. No need to write the units. 1 1 1 Hint: Use the formula P, + -=-= PV ₁² ₁ + 8²₁ = P₂+ = Pv₂ + 8 ² ₂ = P3+ -Pv 3+8²3₁ '1 2 Waterarrow_forwardConsider water (density = 1000 kg/m^3) flow in a piping network. The pressure, velocity, and elevation at a specified point (point 1) of the flow rate are 155 kPa, 1.8 m/s, and 14 m. The pressure and velocity at point 2 are 170 kPa and 3.5 m/s. Neglecting frictional effects, the elevation at point 2 isarrow_forward2. The characteristics of two centrifugal pumps at constant speed are as follows: Q(m3/s) 0.0 006 0.012 0.018 0.024 0.030 0.036 Pump A H(m) 22.6 21.9 20.3 17.7 14.2 9.7 3.9 n(%) 32 74 86 85 66 28 Pump B H(m) 1 6.2 13.6 1 1.9 11.6 1 0.7 9.0 6.4 n(%) 14 34 60 80 80 60 A pumps is required to lift water continuously through 3.2 m of vertical lift and the pipe to be used is 21 m long, 10 cm diameter and friction coefficient is 0.005. Select the more suitable pump between pump A and B for this duty and justify your selection. What power input will be required by the selected pump? [Pump B, 3.53 kW]arrow_forward
- 2. A spherical tank with radius R (-1.5 m) has a hole at the bottom through which water drains out. The flow rate, Q, through the hole is estimated as Q=0.55m² √2gh where r is the hole radius (=0.015 m), g is the gravity constant (=9.81 m/s²), and h is the depth of water. R For the spherical tank, the volume of water, V, is given by V= h h² (3R-h) 3 The initial height of water -Q using Explicit Euler's method (A/= 200 sec), 4th dV is 2.95 m. Solve the mass balance equation H di order Runge-Kutta method (A = 200 sec), and ode45 solver. Plot water height (h) vs. time (r) for each At for 0≤t≤5000 sec and confirm that the 4th order RK method is more accurate than Explicit Euler method (we regard the ode45 solution as the true solution). Use ExplicitEuler.m and rk4.m files. Solve the same problem also using Simulink.arrow_forwardQ2. The following particulars relate to a two row velocity compounded impulse wheel which forms a first stage of a combination turbine. Steam velocity at nozzle outlet = 579.12m/s Mean blade velocity = 115.82m/s Nozzle outlet angle = 16° Outlet angle first row of moving blades = 18° Outlet angle fixed guide blades = 22° Outlet angle, second row of moving blades = 36° Steam flow rate = 2.4 kg/s The ratio of the relative velocity at outlet to that at inlet is 0.84 for all blades. Determine for each row of moving blades the following ⚫ The velocity of whirl • The tangential thrust on blades • The axial thrust on the blades • The power developed What is the efficiency of the wheel as a whole?arrow_forwardP.5.1 Show that for homologous pumps, the specific speed (Ns) of them is not depended on the impeller rotational speed (N) and its diameter (D).arrow_forward
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