2.17 An apparatus for measuring thermal conductivity employs an electrical heater sandwiched between two identical samples of diameter 30 mm and length 60 mm, which are pressed between plates maintained at a uniform temperature T = 77°C by a circulating fluid. A conduct- ing grease is placed between all the surfaces to ensure good thermal contact. Differential thermocouples are imbedded in the samples with a spacing of 15 mm. The lateral sides of the samples are insulated to ensure one- dimensional heat transfer through the samples. -Plate, T Sample- AT Heater Insulation leads Sample- AT₂ Plate, T (a) With two samples of SS316 in the apparatus, the heater draws 0.353 A at 100 V, and the differential thermocouples indicate AT₁ = AT2 = 25.0°C. What is the thermal conductivity of the stainless steel sam- ple material? What is the average temperature of the samples? Compare your result with the thermal con- ductivity value reported for this material in Table A.1. (b) By mistake, an Armco iron sample is placed in the lower position of the apparatus with one of the SS316 samples from part (a) in the upper portion. For this situation, the heater draws 0.601 A at 100 V, and the differential thermocouples indicate AT₁ = AT₂ = 15.0°C. What are the thermal conductivity and aver- age temperature of the Armco iron sample?
2.17 An apparatus for measuring thermal conductivity employs an electrical heater sandwiched between two identical samples of diameter 30 mm and length 60 mm, which are pressed between plates maintained at a uniform temperature T = 77°C by a circulating fluid. A conduct- ing grease is placed between all the surfaces to ensure good thermal contact. Differential thermocouples are imbedded in the samples with a spacing of 15 mm. The lateral sides of the samples are insulated to ensure one- dimensional heat transfer through the samples. -Plate, T Sample- AT Heater Insulation leads Sample- AT₂ Plate, T (a) With two samples of SS316 in the apparatus, the heater draws 0.353 A at 100 V, and the differential thermocouples indicate AT₁ = AT2 = 25.0°C. What is the thermal conductivity of the stainless steel sam- ple material? What is the average temperature of the samples? Compare your result with the thermal con- ductivity value reported for this material in Table A.1. (b) By mistake, an Armco iron sample is placed in the lower position of the apparatus with one of the SS316 samples from part (a) in the upper portion. For this situation, the heater draws 0.601 A at 100 V, and the differential thermocouples indicate AT₁ = AT₂ = 15.0°C. What are the thermal conductivity and aver- age temperature of the Armco iron sample?
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
Related questions
Question
Transcribed Image Text:2.17 An apparatus for measuring thermal conductivity
employs an electrical heater sandwiched between two
identical samples of diameter 30 mm and length 60 mm,
which are pressed between plates maintained at a uniform
temperature T = 77°C by a circulating fluid. A conduct-
ing grease is placed between all the surfaces to ensure
good thermal contact. Differential thermocouples are
imbedded in the samples with a spacing of 15 mm. The
lateral sides of the samples are insulated to ensure one-
dimensional heat transfer through the samples.
-Plate, T
Sample-
AT
Heater
Insulation
leads
Sample-
AT₂
Plate, T
(a) With two samples of SS316 in the apparatus, the
heater draws 0.353 A at 100 V, and the differential
thermocouples indicate AT₁ = AT2 = 25.0°C. What
is the thermal conductivity of the stainless steel sam-
ple material? What is the average temperature of the
samples? Compare your result with the thermal con-
ductivity value reported for this material in Table A.1.
(b) By mistake, an Armco iron sample is placed in
the lower position of the apparatus with one of the
SS316 samples from part (a) in the upper portion. For
this situation, the heater draws 0.601 A at 100 V, and
the differential thermocouples indicate AT₁ = AT₂ =
15.0°C. What are the thermal conductivity and aver-
age temperature of the Armco iron sample?
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps
Recommended textbooks for you
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY