# Kitchen water at 10C flows over a 10-cm-diameter pipe with a velocity of 1.1 m/s. Geothermal water enters the pipe

## Question:

Kitchen water at 10°C flows over a 10-cm-diameter pipe with a velocity of 1.1 m/s. Geothermal water enters the pipe at 90°C at a rate of 1.25 kg/s. For calculation purposes, the surface temperature of the pipe may be assumed to be 70°C. If the geothermal water is to leave the pipe at 50°C, the required length of the pipe is

(a) 1.1 m

(b) 1.8 m

(c) 2.9 m

(d) 4.3 m

(e) 7.6 m

(For both water streams, use k = 0.631 W/m . K, Pr = 4.32, v = 0.658 × 10^{-6} m^{2}/s, c_{p} = 4179 J/kg.K)

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**Related Book For**

## Heat And Mass Transfer Fundamentals And Applications

**ISBN:** 9780073398181

5th Edition

**Authors:** Yunus Cengel, Afshin Ghajar

**Question Details**

Chapter #

**7**- EXTERNAL FORCED CONVECTIONSection: Problems

Problem: 141

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