Fundamentals of Momentum, Heat, and Mass Transfer
Fundamentals of Momentum, Heat, and Mass Transfer
6th Edition
ISBN: 9781118947463
Author: James Welty, Gregory L. Rorrer, David G. Foster
Publisher: WILEY
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Chapter 1, Problem 1.23P
Interpretation Introduction

Interpretation: The rise in the height of water at 68°C in the capillary tube is to be calculated.

Concept introduction:

The surface tension in N/m as the function of temperature is given as:

  σ=0.123(10.00139T)

The upward force due to surface tension will be equal to the downward force due to the weight of liquid.

The height up to which water will rise is given as:

  h=2σcosθρgr

Here, σ is the surface tension, θ is the contact angle, ρ is the density of the liquid, g is the acceleration due to gravity, and r is the radius of the tube.

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