Question: In a manufacturing process, long rods of different diameters are at a uniform temperature of 400C in a curing oven, from which they are removed

In a manufacturing process, long rods of different diameters are at a uniform temperature of 400°C in a curing oven, from which they are removed and cooled by forced convection in air at 25°C. One of the line operators has observed that it takes 280 seconds for a 40-mm. diameter rod to cool to an safe-to-hand/e temperature of 60°C. For an equivalent convection coefficient, how long will it take for an 80-mm-diameter rod to cool to the same temperature? The thermo physical properties of the rod are p = 2500 kg/m³ ∙ c = 900 J/kg ∙ K, and k = 15 W/m ∙ K. Comment on your result. Did you anticipate this outcome?

Step by Step Solution

★★★★★

3.45 Rating (168 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

KNOWN Long rods of 40 mm and 80mm diameter at a uniform temperature of 400C in a curing oven are rem... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

8-E-M-E-H-M-T (415).docx

120 KBs Word File

Students Have Also Explored These Related Mechanical Engineering Questions!

In a manufacturing process that laminates several ceramic layers, 1% of the assemblies are defective. Assume that the assemblies are independent. (a) What is the mean number of assemblies that need...

An automatic machine in a manufacturing process is operating properly if the length of an important subcomponent is normally distributed with a mean =80 cm and a standard deviation =2 cm. a. find...

The Egbert Company uses an industrial chemical, XRG, in a manufacturing process. Information as to balances on hand, purchases, and requisitions of XRG is given in the following table. Transaction...

5 . 6 8 In a manufacturing process, long rods of different diameters are at a uniform temperature of 4 0 0 C in a curing oven, from which they are removed and cooled by forced convection in air at 2...

In a certain manufacturing process, long rods of 50-mm diameter come out of an oven at 500 C. They are cooled by forced convection in air at 25C which produces a convective heat transfer coefficient...

Please provide spc chart and answers of f,g,h questions A manufacturing process produces rods for a mechanical device. Engineers have determined that the diameters of the rods must be between 20.80...

In a manufacturing process, long aluminum rods of square cross section with d = 25 mm are cooled from an initial temperature of T i = 400C. Which configuration in the sketch should be used to...

Suppose a company manufactures plastic lids for disposable coffee cups. When the manufacturing process is working correctly, the diameters of the lids are approximately Normally distributed with a...

MC Qu . 0 6 - 1 3 Which manufacturing process can produce... Which manufacturing process can produce many different product varieties but has a long customer experience time? Multiple Choice Line...

Which manufacturing process can produce many different product varieties but has a long customer experienced lead time? Question 63 options: Line flow Repetitive flow Continuous flow Batch flow...

The following materials standards have been established for a particular product: Standard quantity per unit of output 4.4 pounds Standard price $13.20 per pound The following data pertain to...

The calcium (Ca) content of a powdered mineral substance was analyzed 10 times with the following percent compositions recorded: a. Find a 99% confidence interval for the true calcium content of this...

\ int ( x ^ ( 3 ) ) / ( ( 8 1 - x ^ ( 2 ) ) ^ ( 2 ) ) dx trigonometric substitution

What is the benefit of calculating group means in the information table?

Many worldwide cities are in locations where extreme weather conditions can damage critical urban infrastructures. Select a representative at-risk city and design a structural system to shield the...

Identify why factoring may be an expensive source of funds.

Describe the three different types of cost system that can be used to assign costs to cost objects.

After the tangible assets have been adjusted to current market prices, the capital accounts of Grayson and Harry Barge have balances of $64,000 and $86,000, respectively. Lewan Gorman is to be...

What was the IMF trying to achieve with the conditions attached to its loans to Egypt? If implemented correctly, do you think they will ultimately improve Egypts economy? Why might these conditions...

The following observed rate data have been reported for Pt-catalyzed oxidation of SO2 at 763K obtained in a differential fixed-bed reactor at atmospheric pressure and containing a catalyst with a bed...

A commercial cumene cracking catalyst is in the form of pellets with a diameter of 0.35 cm which have a surface area, Am, of 420m2 g 1and a void volume, Vm, of 0:42 cm3 g1. The pellet density is 1.14...

A 1.0% Pd/SiO2 catalyst for SO2 oxidation is being studied using a stoichiometric O2/SO2 feed ratio at a total pressure of 2 atm. At a temperature of 673 K, a rate of 2:0 mole SO2 s-1 L cat-1 occurs....

connect 4 . py

A number of people were asked how many days they would wait to seek medical treatment if they were suffering pain that interfered with their ability to work. The results are presented in the...

Requlred: Based on the Information in the table below, prepare comparative balance sheets for Windswept Woodworks, Incorporated for years 1 and 2 . (Round your answers to the nearest whole number.)