Thermal conductivity and diffusivity of the plastic

Assignment Help Mechanical Engineering

Reference no: EM13711535

A plastic coating is applied to wood panel by first depositing molten polymer on a panel and then cooling the surface of the polymer by subjecting it to air flow at 25^oC. The heat of reaction associated with solidification of polymer may be neglected and the plastic/wood interface may be assumed to be adiabatic. If the thickness of the coating is 2 mm and it has an initial uniform temperature of 200^oC; (a) how long will it take for the surface to achieve a safe-to-touch temperature of 42^oC if the convection coefficient is h = 200 W/m2-K? (b) What is the corresponding temperature at the plastic/wood interface? The thermal conductivity and diffusivity of the plastic are 0.25 W/m-K and 1.20 x 10^-7 m2/s, respectively.

Reference no: EM13711535

Questions Cloud

Measure the horizontal distance lengths of traverse : Measure the horizontal distance lengths of traverse legs using pacing, surveyor's tape and total station - familiarise with the use of GPS to measure coordinates and other computations (i.e. Slope and horizontal distances, area, perimeters etc.)

Conduct the necessary marketing analysis for your strategy : Analyze the MARKETING ENVIRONMENT. The Marketing Environment is covered in a Powerpoint presentation provided - Briefly explain what you did and indicate the sources you have used.

Change in enthalpy of oxygen as temperature changes : What is the change in enthalpy (in kJ/kg) of oxygen as its temperature changes from 29Â°C to 181Â°C? Assume an ideal gas with R = 0.2598 kJ/kg-K and a ratio of specific heats of 1.4.

Calculate range of typical machining time for face milling : Calculate the range of typical machining time for face milling a 10-in. long, 2-in. wide cutter with a depth of cut of 0.1-in , the cutter has 10 teeth .for the following work piece materials :1.low-carbon steel 2.titanium alloys 3.alumminum alloys 4..

Thermal conductivity and diffusivity of the plastic : A plastic coating is applied to wood panel by first depositing molten polymer on a panel and then cooling the surface of the polymer by subjecting it to air flow at 25oC. The heat of reaction associated with solidification of polymer may be neglected..

Determine the maximum vertical support reaction : Draw the quantitative influence line for the vertical support reaction at point A and determine the maximum vertical support reaction that can be developed at point.

Dertermine the final temperature of the water vapor : Water in a vertical piston cylinder is heated at constant pressure of 10 bar. It is initially at 179.9 0C and has a specific volume of 0.1 m3/kg and is heated to a final specific volume of 0.248 m3/kg. Changes in kinetic and potential energies are ze..

Determine the change in internal energy : 1 /2kg of a liquid-vapor water mixture in a rigid tank initially at 2 bar is heated by 120V heater for 5 minutes until it becomes a saturated vapor at 4 bar. Changes in kinetic and potential energies can be ignored.

Contribution of grain boundary strengthening in an alloy : Nan crystalline materials have grain sizes ranging from 0.01 to 0.1 microns. If the contribution of grain boundary strengthening in an alloy with grains of 0.1 microns is 20 MPa, what would you expect it to be if the grain size were reduced to 0.01 m..

User Account

All Pages