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Air usually constitutes up to half of the volume ofcommercial ice creams and takes the form of smallspherical bubbles interspersed within a matrix of frozenmatter. The thermal conductivity of ice cream that containsno air is
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- The inner and outer surfaces of a 0.5-cm-thick 2-m x 2-m window glass in winter are 10°C and 3°C, respectively. If the thermal conductivity of the glass is 0.78 W/m . °C, deter[1]mine the amount of heat loss, in kJ, through the glass over a period of 5 hours. What would your answer be if the glass were 1 cm thick?arrow_forwardA container filled with a sample of an ideal gas at the pressure of 1.5 atm. The gas is compressed isothermally to one-sixth of its original volume. ?What is the new pressure of the gas in kPa 9 0 4 0 400arrow_forwardIn a double-glazed window, the panes of glass are separated by 1.0 cm and the space is filled with a gas with thermal conductivity 24 mW K−1 m−1. What is the rate of transfer of heat by conduction from the warm room (28 °C) to the cold exterior (−15 °C) through a window of area 1.0 m2? You may assume that one pane of glass is at the same temperature as the inside and the other as the outside. What power of heater is required to make good the loss of heat?arrow_forward
- 790kg/m' 49 CHAPTER 1 1-109E Consider a U-tube whose arms are open to the atımosphere. Now equal volumes of water and light oil (p = lbm/ft') are poured from different arms. A person blows from the oil side of the U-tube until the contact surface of the two fluids moves to the bottom of the U-tube, and thus the liquid levels in the two arms are the same. If the fluid height in each arm is in, determine the gage pressure the person exerts on the pil by blowing. 1-101 0-75M Air 0-15M Oil Water FIGURE P1-109Earrow_forwardWater at 50°C and 1 atm pressure is heated to 100°C at constant pressure. Using coefficient of volume expansion data, determine the change in the density of water. (Just write the numerical answer. Include - if the answer is negative. No need to put the unit.) Properties of saturated water Volume Specific Thermal Prandti Enthalpy Expansion Number Density P. kgima Conductivity k, Wim - K Dynamic Viscosity H. kgfm -s Heat Saturation of Coefficient G Jkg - K Pr 8, 1/K Liquid Pressure Temp. T. "C Vaporization hng, kkg Pat, kPa Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor 1854 1857 1862 0.561 0.571 0.580 1.792 x 10-3 1.519 x 10-3 0.0176 1.307 x 10-3 1.138 x 10-3 0.0182 1.002 x 10-3 0.973 x 10-5 1.00 -0.068 x 10-3 0.015 x 10 0.733 x 10- 0.138 x 10 3 0.195 x 10 3 4217 0.0171 0.922 x 10 5 0.934 x 10-5 0.946 x 10 0.959 x 10 0.01 0.6113 999.8 999.9 0.8721 1.2276 999.7 0.0048 2501 2490 13.5 0.0068 4205 0.0173 11.2 1.00 10 0.0094 2478 4194 9.45 1.00 0.0128 0.0173 2466 2454 8.09…arrow_forwardQI/The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8 m long. The top surface is absorbing solar radiation at a rate of 200 W/m2, and the temperature of the ambient air is 30°C. Assuming the roof of the car to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the equilibrium temperature of the top surface of the car. Ans =35.1 carrow_forward
- A 2m^2 wall of 1010steel is 8 mm thick. If the outside of the wall is100 °C, andyou measure aheat flux of 80 kW/m2coming off the wall, what is the temperature of the insideof thewall?arrow_forwardConvection is the mechanism of mass transfer through a moving fluid that occurs only in a forced way. Choose an option: Real or Falsearrow_forward. Ice at 0 ℃, the dimensions of which are given in the figuremass of stagnant air with a temperature of 20 ℃has been left. All surfaces of ice in contact with airheat from the air to the ice masstransfer and the rate of ice melting (in g/s)find it. Take the melting temperature of ice 333.4 kJ/kgarrow_forward
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