An oil preheater consists of a single tube of 10 mm diameter and 25 m length. The tube is heatedby a heat rate per unit length of q' = ax2 [W/m], where a = 1.2 W/m³. Before entering the tube,the oil has a uniform temperature of 25 °C and a flow rate of 0.025 kg/s. The hydrodynamicboundary layer has been fully developed.(a) Determine the type of flow (laminar) or turbulent) inside the tube. Is it fully developed?(b) Calculate the mean fluid temperature and the surface temperature at the tube exit.Note: When determining the convection coefficient, use the correlation equation forconstant heat flux.Properties of the oil: p = 865.8 kg/m³, cp=2035 J/kg K, μ= 8.36×102 N⚫s/m², k = 0.141W/m K, and a = 0.8×107 m²/s.knowns:q' = ax²L: 25mD= 0.01mm = 0.025 kg/sTm,i=25 C0x(Tm.oassumptions qwns!Steady flow

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Answered: An oil preheater consists of a single…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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An oil gusher shoots crude oil 23.0 m into the air through a pipe with a 0.100 m diameter. Neglecting air resistance but not the resistance of the pipe, and assuming laminar flow, calculate the pressure (in N/m2) at the entrance of the 45.0 m long vertical pipe. Take the density of the oil to be 900 kg/m3 and its viscosity to be 1.00 (N/m2) · s (or 1.00 Pa · s). Note that you must take into account the pressure due to the 45.0 m column of oil in the pipe.
9At 1 atm and 20 oC, air flows in a 7 cm diameter tube. What should be the maximum air velocity to keep the flow laminar? (kinematic viscosity 1.516E-5 m^2/s)
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a] Steam at 280 oC, tube=26 W/m. It flows at a speed of 4.0 m/s along a pipe made of iron-steel material with a temperature of 0°C. The inner diameter of the iron-steel pipe is 6.0 cm and the outer diameter is 6.8 cm. In order to reduce the heat transfer, the iron-steel pipe is first covered with 2.0 cm thick glass wool (k = 0.38 W/m. oC), then with another 3.5 cm thick insulation material (k = 0.01 W/m. oC). The insulated iron-steel pipe is in the atmospheric environment where the temperature is 18 oC. The convective heat transfer coefficient on the outside atmospheric side of this pipe, where the steam flows, is 36 W/m2. oC, the film heat transfer coefficient on the steam side is 80 W/m2. Calculate the heat transferred per unit pipe length (W/m), since it is known to be °C. b] Calculate the thickness of the material when the pipe is sheathed externally with a material with a thermal conductivity of k=0.02 W/m.oC in order to reduce the heat to be transferred by 20% in the unit pipe…
QI/An electronic device is cooled by water flowing through capillary holes drilled in the casing. The temperature of the device casing is constant at 353 K. The capillary holes are 0.3m long and 2.54x10m in diameter. If water enters at a temperature of 333 K and flows at a velocity of 0.2 m/s, calculate the outlet temperature of the water.
An oil gusher shoots crude oil 23.0 m into the air through a pipe with a 0.100 m diameter. Neglecting air resistance but not the resistance of the pipe, and assuming laminar flow, calculate the pressure (in N/m2) at the entrance of the 45.0 m long vertical pipe. Take the density of the oil to be 900 kg/m3 and its viscosity to be 1.00 (N/m2) · s (or 1.00 Pa · s). Note that you must take into account the pressure due to the 45.0 m column of oil in the pipe.
Thermo-Fluid
Air flows from a 10cm pipe in which the temperature and pressure are 4-C and 280kpa, respectively, into a 5cm pipe in which the pressure is 147kpa gage. Calculate the velocity and discharge in each pipe, assuming isothermal conditions, standard atmospheric pressure and no losses. The gas constant for air is 280N-m/kg-K.
Crude Oil is flowing through a circular pipe with a centerline velocity of 0.5m/s at a temperature of 60 degrees Celcius and viscosity of 5.5 mPa s. Determine the shear stress at the pipe surface if a parabolic velocity distribution is assumed. Also, indicate the kinematic viscosity of the crude oil at the given temperature. The density of the crude oil is 855 km/m^3 and the pipe diameter is 20 mm.
Water flows at 5m/s is passed through a tube of 2.5 cm diameter, it is found to be heated from 20 °C to 60 °C. The heating is achieved by condensing steam on the surface of the tube and subsequently the surface temperature of the tube is maintained at 90degC. Water properties are as follows: density=995kg/m3, kinematic viscosity=.657x10-6 m2/s, Pr=4.43, k=.628W/mK, cp=4178J/kgK. a) Determine the Reynolds number b) What is the thermal coefficient on question number c) what is the heat absorbed by the water?
Q2:A) Define the bulk temperature (Tn), and prove that : T₁, - 2 ur dr B) Ethylene glycol flows at 0.01 kg/s through a 3 mm diameter, thin walled_tube. The tube is coiled and submerged in a well-stirred water bath maintained at 25 °C. If the fluid enters the tube at 85 °C, what heat rate and tube length are required for the fluid to leave at 35 °C ? At 60 °C, μ = 0.00522 kg/m.s, k = 0.26 W/m.K, C, 2562 J/kg.K. -

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