5.6 Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air envi- ronment for which T325 K and h = 20 W/m².K. Assuming the properties of the steel to be k = 40 W/m.K, p= 7800 kg/m³, and c=600 J/kg K, estimate the time` required for the cooling process.

5.6 Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air envi- ronment for which T325 K and h = 20 W/m².K. Assuming the properties of the steel to be k = 40 W/m.K, p= 7800 kg/m³, and c=600 J/kg K, estimate the time` required for the cooling process.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.36P

See similar textbooks

Similar questions

A 0.6-cm diameter mild steel rod at 38C is suddenly immersed in a liquid at 93C with hc=110W/m2K. Determine the time required for the rod to warm to 88C.
3.2 High-strength steel is required for use in building structures and equipment (e.g., cranes). It is produced by heat treating quench-hardened steel in a process called tempering that reduces brittleness and imparts toughness. In a production facility, alloy steel plates (k = 50 W/m K, c = 460 J/kg K, and ρ = 7865 kg/m3) of thickness 3.0 cm have to be tempered in a convective oven by heating them to 550°C. If the plates are initially at 40°C and the air inside the heat treating oven is at 700°C with a convective heat transfer coefficient of 45 W/m2 K, determine how long the plate has to remain in the oven.
I need the answer as soon as possible
A polished stainless steel sphere (r= 5cm) is at a temperature of 540 C. The ambier air is at 20 C. What is the instantaneous heat transfer rate?
Steel balls 12 mm in diameter are annealed by heating to 1100 K and then slowly cooling to 360 K in an air environment for which T. = 325 Kand h = 20 W/m2-K. Assuming the properties of the steel to be k = 40 W/m-K,p = 7800 kg/m, and c = 600 J/kg-K, estimate the time required for the cooling process. The time required for the cooling process isi h.
2000kg cast iron housing at 450 degree Celsius is quenched in 5000kg of water at 15 degree C. What is the amount of heat transferred to water, use specific heat of water to be 4.18 kJ/kg.K and specific heat of iron to be 0.42 kJ/kg.K
There is 100 grams of water in a brass calorimeter of mass 200 grams. It is found that 590 calories are required to raise the temperature of water and container from 20°C to 25°C. What is the specific heat of the brass? COMPLETE FBD SOLUTION AND REQUIREMENTS PS. THIS IS A HEAT TRANSFER PROBLEM
What is the minimum amount of ice at OPC that must be added to the contents of a can of diet cola (340m) to cool it down from 20.5C to 0C Assume that the specific heat and density of the diet colo are the same as for water and that no heat is gained or lost to the surroundings. The latent heat of fusion of ice à 3353/g Specific Heat of water 4.184 J/gK and Density of water is 1 g/mL
4. A pupe 20em in diameter contains steam aFi50Ć and iu protected with a coverung 5cm thick for which K=0.00 25. If the temperature of the outer surface of +he coverung ús 40°c, find. the temperature half-way through the covercing under steady stare conditions.
answer provided is correct
An egg with mean diameter of 40 mm and initially at 20 °C is placed in a boiling water for (4min) and found to be boiled to consumers taste. For how long should a similar egg for same consumer be boiled when taken from a refrigerator at 5 °C. Take the following properties for egg: k = 10 Wim. °C and the heat transfer coefficient (h = 100 W/m. "C) .p= 1200 kJ / kg. "C, C = 2 kJ/ kg. "C,
Read the question carefully and give me right solution according to the question. Note: Don't copy other expert solution. I have other website solution. A metallic ball of radius ro = 5 mm, is initially in equilibrium at 400 C in a furnace. It is suddenly dropped to water at 20 C hw 10814 W/m2 K, . The properties of the sphere are density= 3000 kg/m3, k = 20 W/m_ K, c = 1000 J/kg K, and α= 6.66E-6 m2/s. Calculate the time required for the center of the sphere to cool to 50 C.