hw4-010

hw4-010 - D e p a r t m e n t o f C h e m ic a l E n g in e...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Department of Chemical Engineering University of California, Santa Barbara ChE120B Heat Transfer Winter 2010 Homework 4 Out: Wednesday, February 3, 2010 In: Wednesday, February 10, 2010 Read: up to section 6 of class notes a) in last week’s assignment, take the fluid viscosity to be 10 cp in the problem regarding falling through a fluid, if you haven’t already assumed a value. 1. Estimate the thermal penetration depth in water, brick, and steel after 1 second and after 1 hour. Assume no convection in water. Material k(W/m-K) C p (J/kg-K) ρ (kg/m 3 Steel 61 460 7870 Water 0.6 4100 1000 Brick 0.45 840 1800 2. Estimate the contact temperature between a human foot and three beds of 400 C rocks, one of porous lava rocks of solid volume fraction 0.25, a second of porous lava rocks with a solid volume fraction of 0.75 and a third of solid lava rock. Assume that the rock part of the lava rocks has a thermal conductivity, k o = 3 W/m-K, a heat capacity of 800 J/kg-K and a density, ρ o of 2200 kg/m 3 , and the rest is air. The effective thermal conductivity of a porous rock is in which k o is the thermal conductivity of the continuous medium (rock), k 1 is the thermal
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/22/2011 for the course CHE 120B taught by Professor Zasadinski during the Winter '10 term at UCSB.

Page1 / 3

hw4-010 - D e p a r t m e n t o f C h e m ic a l E n g in e...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online