A food product with 80% moisture content in a 7 cm diameter can wants to be frozen. product density is 1000 kg / m³ thermal conductivity is 1.0 W / (m K) and initial freezing temperature is -2.25 degrees Celsius after 8 hours in freezing medium -35 degrees Celsius Temperature to -10 degrees Celsius estimate convection heat transfer coefficient freezing medium assume the can as an infinite cylinder h =

Q1) A long bar (k = 1.2 W/m.K, p = 2500 kg/m³, c = 300 J/kg. K) has an initial uniform temperature of 30 °C and subjected to the boundary conditions shown. Take Ax = Ay = 0.01 m. Determine the stability criteria for the nodes 0, 2, 4, 5, 7, 9, 10, and 14. Which one can you use? y Convection with 1 h=6W/m2°C, T∞ = 20°C 0 1 2 3 M 5 6 7 8 9 13 14 10 11 12 Isothermal at 70°C Insulated

Estimate the thermal conductivity of Applesauce at 35 ° C. (Air content = 78.0% wet basis). Thermal conductivity of the material = Answer   W / m ° C

Subject : Thermofluid Question : A wind turbine four 10 cm diameter cups with a center-to-center distance of 40 cm, as shown in Figure 4. Due to a malfunction, the pivot is suddenly stuck, and the cups stop rotating. If the wind speed is 12 m/s moving at the described direction and air density is 1.25 kg/m3. Determine the maximum torque this turbine applies on the pivot.

Water has many unique molecular properties that make it extremely important. One application that takes advantage of these properties is a so-called evaporative cooler (or swamp cooler, https://en.wikipedia.org/wiki/ Evaporative_cooler), which is a device that cools air through the evaporation of water. Liquid water is changed into water vapor, whereby the energy used to evaporate the water (i.e. latent heat of vaporization) is consumed from the internal energy (i.e. temperature) of the air brought in from outside. The result is a lowering of the outside air temperature as it is brought inside. The process tends to also increase the humidity (vapor content) of the air. Hence it is an attractive option in some semi-arid regions where outside air is very hot and dry. a) What is the latent heat of vaporization for water? Is this value generally large or small compared to other substances? What are some of the implications of this?  b) Suppose you have an evaporative cooler that has an…

Radioactive wastes are pack

just case b

(cc) BY-NO-SA Niel Crews, 2013 An insulated, rigid vessel is initially empty (evacuated). However, it is connected to a steam line that is maintained at 200 psia and 500 °F. The valve is opened until the flow into the tank slows and stops (which occurs when the pressure in the tank is equal to the pressure in the steam line), at which point the valve is closed. What is the temperature within the vessel? °F

answer provided is correct

John is employed by a new food processing plant where eggs are to be boiled in large quantities to produce egg salad. John has been assigned the task of determining the minimum cooking time for the eggs, utilizing his vast knowledge of heat transfer. As a basis of calculation, he assumed that the eggs are perfect spheres with a diameter of 5 cm and uniform material properties (r =1000kg/m'; Cp = 3300 J/(kg K) and k=0.75 W/(m-K)). The eggs were taken from a cold storage room at 5°C and immediately put into pots of boiling water at 100°C. The convective heat transfer coefficient of the water is h = 1500 W/m°K. For health safety reasons, the plant requires that the entire egg must be at a temperature above 75°C for at least 20 seconds in order for the cooking process to be complete. a. What is the minimum time necessary to cook the egg to company specifications? b. In the testing lab, John forgot to remove a batch of eggs, and they remained in the cooking pot long enough to reach a…