Combustion gases passing through a 5-cm-internal-diameter circular tube are used to vaporize waste water at atmospheric pressure. Hot gases enter the tube at 225 kPa and 250°C at a mean velocity of 2.5 m/s, and leave at 150°C. If the average heat transfer coefficient is 150 W/m²K and the inner surface temperature of the tube is 110°C, determine (a) the tube length and (b) the rate of evaporation of water.

Combustion gases passing through a 5-cm-internal-diameter circular tube are used to vaporize waste water at atmospheric pressure. Hot gases enter the tube at 225 kPa and 250°C at a mean velocity of 2.5 m/s, and leave at 150°C. If the average heat transfer coefficient is 150 W/m²K and the inner surface temperature of the tube is 110°C, determine (a) the tube length and (b) the rate of evaporation of water.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

**Problem Statement**

Combustion gases passing through a 5-cm internal diameter circular tube are used to vaporize waste water at atmospheric pressure. Hot gases enter the tube at 225 kPa and 250°C at a mean velocity of 2.5 m/s, and leave at 150°C. If the average heat transfer coefficient is 150 W/m²K and the inner surface temperature of the tube is 110°C, determine (a) the tube length and (b) the rate of evaporation of water.

*Note: The image contains a problem involving the use of combustion gases to vaporize waste water. Relevant thermodynamic properties and heat transfer coefficients are provided, with the objective of calculating the required tube length and evaporation rate.*

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Step 1: Determination of Given data and variables

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Step 2: Determination of heat transfer by hot gases

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Step 3: Determination of Convective heat transfer rate

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Step 4: Determination of Length of tube

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Step 5: Determination of Rate of Evaporation

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