Ask Question, Ask an Expert


Ask Chemical Engineering Expert

problem 1: A 50 cm diameter pipeline in the Arctic Carries hot oil at 30 0C and exposed to a surrounding temperature of around -20 0C. Special powder insulation 5 cm thick surrounds the pipe and has a thermal conductivity of 7 mW/m.0C. Convective heat transfer coefficient on the outside of the pipe is 9 W/m2. 0C. Find out the energy loss from the pipe per meter of length.

problem 2: A house wall might be approximated as two 1.2 cm layers of fiber insulating board, an 8 cm layer of loosely packed asbestos, and 10 cm layer of common brick. Supposing convective heat transfer coefficient 12 W/m2. 0C on both side of the wall. Compute the overall heat transfer for this arrangement.

problem 3: Heat produced uniformly in Stainless steel plate having k = 20 W/m.0C. The thickness of the plate is 1cm and the heat generation rate is 500 MW/m3. If the two sides of the plate are maintained at 100 and 200 0C correspondingly, compute the temperature at the center of the pipe?

problem 4: A circumferential fin rectangular profile is constructed of Cu and surrounds a tube containing a diameter of 1.25 cm. The fin length is 6 mm and its thickness is 0.3 mm. The fin is exposed to the convection environment a 20 0C with h= 55 W/m2.0C base temperature.

problem 5: A tube assembly constructed of Cu with an inside diameter of 1.25 cm, wall thickness of 0.8 mm and circumferential fins about the periphery. The fins have thickness of 3 mm, and are spaced 6 mm apart. If the convective heat transfer coefficient from tube and fins to the surrounding air is 50 W/m2. 0C, compute the thermal resistance for a 30 cm length of the tube fin combination. Find out the fin efficiency for this arrangement? If the inside tube temperature is 100 0C and surrounding temperature is 20 0C, Find out the heat loss per meter length of the tube? What fraction of heat loss by the fin?

problem 6: A piece of Al weighing 6 kg and initially at temperature of 300OC is abruptly immersed in a fluid at a temperature of 20OC. The convective heat transfer coefficient is 58 W/m2. 0C. Taking the Aluminum as a sphere containing the same weight as that given, estimate the time need to cool the aluminum to 90 0C by using the lumped-capacity method of analysis.

problem 7: A 4 cm diameter Cu sphere is initially at uniform temperature of 400 0C. It is abruptly exposed to a convection environment at 30 0C with h = 20 W/m2.0C. Compute time necessary for the center of the sphere to reach a temperature 80 0C.

problem 8: A steel cylinder 10 cm in diameter and 10 cm long is initially at 300 0C. It is immersed in an oil bath that is maintained at 40 0C, with h = 280 W/m2. 0C. Find out the temperature at the center of solid after 2 min.

problem 9: Air at 1 atm, 300K, and Re = 50,000:

a) Flow across the cylinder with a diameter of 10 cm.
b) Flow inside a tube with diameter of 10 cm.
c) Flow all along the flat plate of length 10 cm.

Compute the Average Heat transfer coefficient for each of above cases and comment on outcome.

problem 10: A smooth glass plate is coated with the special electrically conductive film which might be used to produce a constant heat flux on the plate. Find out the air flow velocity which must be employed to remove 850 W from a 0.5-m-square plate, maintained at an average temperature of 65 0C and dissipating heat to air at 1 atm and 20 0C. Assume that the plate as well radiated like black surface to the surrounding 20 0C. What flow velocity would be essential to dissipate the 850 W under this condition?

Chemical Engineering, Engineering

  • Category:- Chemical Engineering
  • Reference No.:- M91081

Have any Question? 

Related Questions in Chemical Engineering

A well is producing from a saturated oilreservoir with an

A well is producing from a saturated oilreservoir with an average reservoir pressureof 3000 psig. Stabilized flow test dataindicates that the well is capable of producing400 STB/day at a bottom-holeflowing pressure of 25 ...

Current and charge in a battery consider a car battery

Current and charge in a battery. Consider a car battery rated at 100 A· h. This battery can supply a current of 100 A for an hour. (a) How much charge can the battery supply? (b) What must be the area of a parallel plate ...

Application convection current the solar wind is a stream

Application: Convection current. The solar wind is a stream of mostly protons emitted by the Sun as part of its normal reaction. The particles move at about 500 km/s and, at the Earth orbit, the particle density is about ...

Write introduction and motivation 1 or 2 pages perhaps

Write Introduction and Motivation (1 or 2 pages), perhaps including some figures of the project and I have attached everything related to the project. Introduction - Brand name: Iclusig Generic name: Ponatinib Company na ...

The total capital investiment for a chemical plantis 1

The total capital investiment for a chemical plantis $1 million, and the working capital is $100,000. if the plant can produce an average of 8000kg of fixed product per dayduring 365-day per year, what selling price in d ...

Question 1 a give three examples for each of natural free

Question 1. (a) Give three examples for each of natural (free) convection and forced convection which occur in industrial processes. (b) The Grashof number and the Reynolds number appear in most correlations of experimen ...

A shell-and-tube heat exchanger with one shell pass and two

A shell-and-tube heat exchanger with one shell pass and two tube passes employs condensing steam at 1 atm on the shell side to heat 10 kg/s of engine oil from 50 to 60°C in the tubes. The steam enters as saturated vapor ...

Because of shortage of copper it was decided to make the

Because of shortage of copper, it was decided to make the fuse in Example 7.4 out of iron (not a very good idea because of corrosion). If the same dimensions, including the width calculated in Example 7.4a are used and t ...

According to experimental results for parallel airflow over

According to experimental results for parallel airflow over a uniform temperature, heated vertical plate, the effect of free convection on the heat transfer convection coefficient will be 5% when GrL/Re2L = 0.08. Conside ...

A potential flow source having an intensity of 10m2s placed

A potential flow source having an intensity of 10m2/s, placed in the point of Cartesian coordinates (1;0), and a sink having identical intensity, placed in the point (-1;0), are combined with a uniform flow at 25 m/s, in ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro