Fabrication and calibration of the transient hot-wire thermal conductivity apparatus for nanofluids

Date

6-2015

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Electronics Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Adrian Augusto M. Sumalde

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

In this study, Wheatstone bridge was used to measure the thermal conductivity of a nanofluid. At the start of each experiment, before applying voltage supply to the circuit, the bridge is balanced by adjusting the electronic load until the power meter reads approximately zero. With the measured voltage output and resistance values, the temperature change of the platinum wire id computed using voltage divider rule. The slope of its plot with respect to time in logarithmic scale is used in computing for the thermal conductivity of the fluid. The circuit is calibrated by adjusting the resistance values until the percent error between the standard value and the average result is within 0 to 5%. Using distilled water as the calibrating fluid, the percent error obtained ranged from 0.001956 to 1.014912%. Validating the results further, Anova F-test was conducted to establish the relation of the measured and the standard. The results showed that the thermal conductivity of water is directly proportional to its temperature. After establishing the accuracy, the Transient Hot-Wire Thermal Conductivity apparatus was the used for nanofluids. Based on the outcome, the thermal conductivity of a nanofluid increases as the percent mixture of nanosilica and its temperature increases.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2015 E64 /F56

Document Type

Thesis

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