Example 2: The local atmospheric pressure in Denver, Colorado (elevation 1610 m), is 83.4 kPa. Air at this pressure is 20°C flows with a velocity of 8 m/s over a 1.5 m  6 m flat plate whose temperature is 140°C (Figure). Determine the rate of heat transfer from the plate if the air flows parallel to the (a) 6-m-long side and (b) the 1.5-m side.

An iron bar 2.0 cm x 3.0 cm x 10.0 cm at a temperature of 95 °C is dropped into a barrel of water at 25 °C. The barrel is large enough so that the water temperature rises negligibly as the bar cools. The rate at which heat is transferred from the bar to the water is given by the expression Q (J/min) = UA (Th - Tw.) where U = 0.05 J/(min cm °C)] is a (cm) is the exposed surface area of the bar, T₁, and T are the surface temperature of the bar and the water temperature, respectively. The heat capacity of the bar is 0.46 J/(g °C). Heat conduction in iron is rapid enough for the temperature T, to be considered uniform throughout the bar. a) Write an energy balance on the bar M = (60 cm³)(7.7 g/cm³) = 462 g C₁ = 0.46 kJ/(kg-°C), T = 25°C U= 0.050 J/(min-cm² °C) |4=2[(2)(3) + (2)(10) +(3)(10)]cm² = 112 cm²

For fluids with small Prandt number   the thermal boundary layer development is much ....................than that of the velocity boundary layer (δt ≫ δ), and it is reasonable to assume ....................... velocity (u = u∞) throughout the thermal boundary layer.     Please fill the blank

A circular pipe with inner diameter of 0.02 m has its inner surface covered with water at 300K. Dry air is flowing inside the pipe at the velocity of 0.8 m/s. The temperature of air is 300K and its pressure is at 1 atm. Calculate: a) Mass transfer from the 0.01 m length pipe b) Rate of heat transfer from pipe to air by mass convection and heat convection

Hot engine oil at 150°C is flowing in parallel over a flat plate at a velocity of 3.30 m/s. Surface temperature of the 1.800-m long flat plate is constant at 50°C. The properties of engine oil at Tf  = (150°C + 50°C)/2 = 100°C are k = 0.1367 W/m∙K, v = 2.046 × 10−5 m2/s, Pr = 279.1. Determine the local convection heat transfer coefficient at 0.200 m from the leading edge and the average convection heat transfer coefficient.   The local convection heat transfer coefficient at 0.200 m from the leading edge is ___ W/m2·K. The average convection heat transfer coefficient is ___ W/m2·K.

Answer the following problem. Show Complete Solution. View Image.

A long tube with cross sectional area 0.468m2 and height 7.27m is standing vertically and filled with an ideal gas. A distance 6.30m from the bottom of the tube is a massless and thin plunger that can move up and down and prevents the gas beneath the plunger from escaping. Above the plunger, a fluid of density 2105kg/m3 can be added. Before the fluid is added, the gas column beneath the plunger is at room temperature (298K) and pressure (101000Pa). This is illustrated in the image below. The fluid is added above the plunger until it is a depth of 0.970000000000001m. What is the pressure on the top of the plunger after the fluid is added?

answer=correct