What is the mass flow rate of air is flowing at a velocity of 20 m/s through a tube with an area of 2 m2 and density of 1.225 kg/m³? Assuming that the airflow is incompressible, what is the new velocity of the mass airflow if the tube narrows to an area of 1 m2? 24.5 kg / s, 10 m/s 49 kg /s, 40 m/s 12.25 kg / s, 20 m /s 50 slugs / s, 40 ft/s

What is the mass flow rate of air is flowing at a velocity of 20 m/s through a tube with an area of 2 m2 and density of 1.225 kg/m³? Assuming that the airflow is incompressible, what is the new velocity of the mass airflow if the tube narrows to an area of 1 m2? 24.5 kg / s, 10 m/s 49 kg /s, 40 m/s 12.25 kg / s, 20 m /s 50 slugs / s, 40 ft/s

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.33P

See similar textbooks

Similar questions

In a refinery, fuel ethanol is flowing in a pipe at a velocity of 1.2 m/s at 2 atm. The refinery needs the ethanol to be at a pressure of 1 atm on a lower level. If the diameter of the pipe at section 1 and 2 are 40cm and 10cm respectively, how far must the pipe drop in height in order to achieve this pressure?
A 20 cm diameter pipe carries air at 24 m / s at a pressure of 148 kpa absolute pressure and 27 ° C. What is the mass flow rate of air? the 20 cm pipe is reduced to 10 cm and the temperature and pressure are 11 ° C and 130.5 kpa. Determine the velocity in the 10cm pipe and the volume flow in both pipes
Air enters a fan through a duct at a velocity of 6.5 m/s and an inlet staticpressure of 2.5 cm H2O less than atmospheric pressure. The air leaves the fan through aduct at a velocity of 11.5 m/s and a discharge static pressure of 7.62 cm H2O above theatmospheric pressure. If the specific weight of air is 1.20 kg/m3 and the fan delivers 9.45m3/s, determine the fan theoretical power and the fan efficiency when the power input tothe fan is 13.75 kW at the coupling?
Water (modeled as an incompressible substance) flows steadily through a circular pipe oftotal length ? = 10 m. The mass flow rate through the pipe is ?̇ = 2 kg s⁄ and the watertemperature drops by 25°C as it moves through the pipe. Pressure losses within the pipeare negligible, as are any changes in potential and kinetic energy of the flowing fluid.a) Determine the rate of energy loss from the water as it moves through the pipe. Youmay treat the water as having a constant specific heat (? = 4.18 kJ kg-K⁄ ). Recall thatfor an incompressible substance Δℎ = Δ? + ?Δ?, where Δ? = ∫ ? ?? and ? is thespecific volume of the substance. Your solution should start with an energy balanceon an appropriately defined system/control volume.b) The air surrounding the pipe is at ?∞ = 25°C and the convection coefficient at theouter surface of the pipe is ℎ = 15 W m2-K⁄ . It is also known that the surfaceemissivity of the pipe is ? = 0.3 and the walls of the room where the pipe is locatedare at ?sur =…
A flow nozzle equipped with a differential pressure gage is used to measure the flow rate of water at 10°C (? = 999.7 kg/m3 and ? = 1.307 × 10−3 kg/m·s) through a 3-cm-diameter horizontal pipe. The nozzle exit diameter is 1.5 cm, and the measured pressure drop is 3 kPa. Determine the volume flow rate of water, the average velocity through the pipe, and the head loss.
A 100-mm diameter jet of water is discharging from a nozzle into the air at a velocity of 36 m/s. the nozzle is inclined at an angle of 25 degrees with horizontal. neglecting air ressistance, determine: 1. the elevation of the highest point with respect to a datum at the tip of nozzle. 2. the area of the jet at the highest point of the stream.
Determine the static fan efficiency if total fan mechanical efficiency is 70% and air is measured at 25 deg C and 760 mmHg for a fan that draws 1.42 cubic meters of air per second at a static pressure of 2.54 cm of water through a duct 300 mm diameter and discharges it through a duct of 275 mm diameter.
A fluid enters a pipe at speed v1=0.1 m/s. the diameter of the tube is d=200mm and the fluid flowing through the pipe is mercury with a specific gravity of 13.6. the mass flow rate is
4. In a geothermal power plant, the used geothermal water at 80°C enters a 15-cm-diameter and 400-m-long un insulated pipe at a rate of 8.5 kg/s and leaves at 70°C before being reinjected back to the ground. Windy air at 15°C flows normal to the pipe. Disregarding radiation, determine the average wind velocity in km/h.
Air flows through a long duct of constant area at 0.15 kg/s. A short section of the duct is cooled by liquid nitrogen that surrounds the duct. The rate of heat loss in this section is 15.0 kJ/s from the air. The absolute pressure, temperature, and velocity entering the cooled section are 188 kPa, 440 K, and 210 m/s, respectively. At the outlet, the absolute pressure and temperature are 213 kPa and 351 K. Compute the duct cross-sectional area and the changes in enthalpy, internal energy, and entropy for this flow. Take C=1 KJ/KgK, C,-0.717 KJ/Kg.K
The liquid storage tank shown in Fig has two inlet streams with mass flow rates w1 and w2 and an exit stream withflow rate w3. The cylindrical tank is 2.5 m tall and 2 m in diam-eter. The liquid has a density of 800 kg/m. Normal operating procedure is to fill the tank until the liquid level reaches a nom-inal value of 1.75 m using constant flow rates:w1=120 kg/min, w2=100 kg/min, and w3=200 kg/min. At that point, inlet low rate w1 is adjusted so that the level remains constant.However, on this particular day, corrosion of the tank has opened up a hole in the wall at a height of 1 m, producing a leak whose volumetric flow rate q4(m3/min) can be approximated by q4=0.025√h−1 where h is height in meters.(a)If the tank was initially empty, how long did it take for theliquid level to reach the corrosion point?(b)If mass flow rates w1,w2,and w3 are kept constant indefi-nitely, will the tank eventually overflow? Justify your answer.
36 - Water flows at a speed of 0.75 m/s in a 6 cm diameter pipe. What is the mass flow rate of the water passing through the pipe? a) 137.5 kg/min B) 353 kg/min NS) 75.4 kg/min D) 127.17 kg/min TO) 88.4 kg/min