Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. The water flow over the surface of the apple creates a convective heat-transfer coefficient of 10 W/(m2-K). Assume the apple can be described as a sphere with an 8 cm diameter and the geometric center is to be reduced to 10°C. The apple properties include thermal conductivity of 0.4 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3 . a. Determine the time that the apples must be exposed to the water. b. If the apple is submerged only for 2 hours, what will be its center temperature?
Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. The water flow over the surface of the apple creates a convective heat-transfer coefficient of 10 W/(m2-K). Assume the apple can be described as a sphere with an 8 cm diameter and the geometric center is to be reduced to 10°C. The apple properties include thermal conductivity of 0.4 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3 . a. Determine the time that the apples must be exposed to the water. b. If the apple is submerged only for 2 hours, what will be its center temperature?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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PLEASEEE NEED IT BEFORE 2:15 PM HUHUHUHU (USED HIESLER CHART)
Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. The
water flow over the surface of the apple creates a convective heat-transfer coefficient
of 10 W/(m2-K). Assume the apple can be described as a sphere with an 8 cm diameter
and the geometric center is to be reduced to 10°C. The apple properties include thermal
conductivity of 0.4 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3
.
a. Determine the time that the apples must be exposed to the water.
b. If the apple is submerged only for 2 hours, what will be its center temperature?
Transcribed Image Text:(T₂-TY(T₂-T)
6-2-
0.1
0.01
0.001
(RH)
1
0
wcha)
0.8
and
**.
2
4
5 10
Ax
20
30 40
50
00
70
Sphere
80 90 100
N₁₁=1
1 =1
PBi
--
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