What are the fin efficiency and effectiveness

Assignment Help Mechanical Engineering
Reference no: EM13708857

Aluminium fins of triangular profile are attached to a plane wall whose surface temperature is 250 oC. The fin base thickness is 2 mm, and its length is 6 mm. The system is in ambient air at a temperature of 20 oC, and the surface convection coefficient is 40 W/m2·K. (a) What are the fin efficiency and effectiveness? (b) What is the heat dissipated per unit width by a single fin?

Reference no: EM13708857

Questions Cloud

Change in internal energy and enthalpy of oxygen : Oxygen at 450K is heated to 850K. Assume oxygen as an ideal gas. Determine the change in internal energy and enthalpy of oxygen per unit mass, using: Data for line over u and line over h from the oxygen table
What is the work done on or by the steam : A piston-cylinder contains 0.1 kg of superheated steam at 180 ¯ C and 5.0 bars. The piston is frictionless and freely floating. Heat is added until the final volume is twice the initial volume.
Creating a grid and specifying the intial flow velocity : Need to get flow around cylinders in a channel by creating a grid and specifying the intial flow velocity.
Radius of moons orbit relative to the earth : What is the total change in velocity required to go from a 200 km altitude circular, Earth orbit to circular orbit with a radius of 384,000 km (the mean radius of moons orbit relative to the earth, but ignore the moons presence}?
What are the fin efficiency and effectiveness : Aluminium fins of triangular profile are attached to a plane wall whose surface temperature is 250 oC. The fin base thickness is 2 mm, and its length is 6 mm. The system is in ambient air at a temperature of 20 oC, and the surface convection coeffici..
Expression for the rate of heat loss to surrounding fluid : A spine attached to a wall maintained at a uniform temperature Tb has the shape of a circular cone with base diameter b, height L and a concave parabolic profile, and it is exposed to a fluid at a uniform temperature T?.
Quality of the refrigerant and the pressure at final state : A well-insulated piston-cylinder device initially contains 5kg of saturated mixture of refrigerant-134a at -12°C, in which 2.55kg of the refrigerant is in the liquid phase. An electric switch is turned on, and a 110-V source supplies current to a res..
Determine the maximum mass flow rate of the steam : A turbine uses steam at 25MPa and 650°C at the turbine inlet to generate 17.5MW of power. The steam enters the turbine at a rate of 90000kg/h. A portion of the steam passing through the turbine is removed for the purposes of feedwater heating (Figure..
Actual rate of heat extraction from the outside air : A heat pump uses refrigerant-134a to extract heat from the outside air at -10°C to maintain a house at 15°C.The refrigerant enters the condenser at 600kPa and 25°C at a rate of 45L/min and leaves as a saturated liquid at 600 kPa. The compressor consu..

Reviews

Write a Review

Mechanical Engineering Questions & Answers

  The freestream condition are those for a standard altitude

consider a lifting flow over a circular cylinder with a diameter of 0.5m.the freestream velocity is 25 ms and the

  A vessel with a frictionless piston contains

A vessel with a frictionless piston contains 1 ft^3 of a gas at 200 psia. The piston is held in position by applying an external force. Calculate the amount of work done if:

  Assuming the variation of thermal conductivity of the wire

a 2 kw resistance heater wire with thermal conductivity k 15 wm-k diameter d .4 cm and length 50 cm is used to boil

  A pump operates at 3000 psi and delivers 5 gpm it requires

1 a pump operates at 3000 psi and delivers 5 gpm. it requires 10 hp to drive the pump. determine the overall efficiency

  An aluminum e 9100 ksi control rod with a circular cross

an aluminum e 9100 ksi control rod with a circular cross section must not stretch more than 0.24 in. when the tension

  Find the steady-state temperature of the wire

Verify that heating the wire may be treated as a lumped-capacity process, find the steady-state temperature of the wire and find how long it takes for the temperature of the wire to reach 100°C.

  A refrigeration system using r-22 as the working fluid has

a refrigeration system using r-22 as the working fluid has condenser and evaporator pressures of 250 psi and 30 psi

  Find the specific gravity of the material

A cube of material is 4 in. on a side and floats at the interface between kerosene and water, as shown in the figure. Find the specific gravity of the material.

  The walls of the tank are constructed of 5-cm-thick

milk is to be transported from texas to california for a distance of 2100 km in a 7-m-long 2-m-external-diameter

  Determine the mass flow rate of hot water withdrawn from

the hot water needs of a household are met by a 60 l electric water heater whose heaters are rated at 1.6 kw. the hot

  An insulated tank is divided into two parts by a partition

An insulated tank is divided into two parts by a partition. One part of the tank contains 2.5 kg of compressed liquid water at 60°C and 600 kPa while the other part is evacuated.

  Heat transfer occurs until the volume on the inside of the

a piston-cylinder device contains 1 kg of h2o. the water is at 800oc and a pressure of 20 mpa. heat transfer occurs

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd