Failure of Gray cast iron pipe in the natural gas distribution system needs to be explained. Concept Introduction: Electrochemical corrosion takes place when metal atoms become ions by losing electrons. Electrochemical corrosion takes place in an aqueous solution where ions are present in water. The process in which electrochemical corrosion creates an electric circuit is known as an electrochemical cell. An electrochemical cell is able to generate energy from a chemical reaction or uses energy to produce a chemical reaction. Corrosion may lead to the failure of substance. Gray cast iron is a type of cast iron having graphic structure. Gray cast iron has resistance to oxidation and high compressive strength.

Question

The diffuser in a jet engine is designed to decrease the kinetic energy of the air entering the engine compressor without any work or heat interactions. Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30°C enters it with a velocity of 359 m/s and the exit state is 200 kPa and 90°C. The specific heat of air at the average temperature of 60°C = 333 K is cp = 1.007 kJ/kg·K. The velocity at the exit is m/s

Answer 1

Question

Chapter 18, Problem 18.3P

Interpretation Introduction

Interpretation:

Failure of Gray cast iron pipe in the natural gas distribution system needs to be explained.

Concept Introduction:

Electrochemical corrosion takes place when metal atoms become ions by losing electrons.

Electrochemical corrosion takes place in an aqueous solution where ions are present in water.

The process in which electrochemical corrosion creates an electric circuit is known as an electrochemical cell.

An electrochemical cell is able to generate energy from a chemical reaction or uses energy to produce a chemical reaction.

Corrosion may lead to the failure of substance.

Gray cast iron is a type of cast iron having graphic structure. Gray cast iron has resistance to oxidation and high compressive strength.

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