College of Engineering

MNE MS Project Defense of Vinay Ningagalla

Date(s): 11/16/2012 3:30 PM - 11/16/20125:30 PM
Location: Science & Engineering Building (SENG), Room 118
Contact: Dr. Ray Laoulache rlaoulache@umassd.edu 508-999-8540
Mechanical Engineering

RESCHEDULED FROM NOVEMBER 9, 2012 TO NOVEMBER 16, 2012 (New Date, New Time, New Location)!

The Mechanical Engineering Department is pleased to announce the MS PROJECT DEFENSE of Mr. VINAY NINGAGALLA on November 16, 2012 from 3:30pm - 5:30pm in Science & Engineering Building, Room 118 (SENG-118).

PROJECT ADVISOR: Dr. Ray Laoulache

COMMITTEE MEMBERS: Dr. Ray Laoulache, Dr. Peter Friedman, Mr. Bob Barbour

TOPIC: Performance Improvement of Shell and Tube Heat Exchangers

ABSTRACT:
This project deals with the development of heat transfer correlations in support of shell-and-tube heat exchangers design by TACO-HVAC, a company for residential and commercial hydronic systems. The company’s objective is to maintain a competitive advantage by manufacturing single-wall and double-wall shell-and-tube heat exchangers more effectively and economically than its competitors. For internal flows in the heat exchanger bundle, the Nusselt correlation proposed by Gnielinski over a wide range of Reynolds numbers is used to calculate the heat transfer coefficient on the tube side. In order to improve heat transfer coefficient correlations on the shell side, experiments are carried out on heat exchangers with different shell diameters and variable baffle pitch. Two-pass and four-pass bundles with single wall and double walls are tested over a wide range of mass flow rates. The parameters for the Nusselt correlations on the shell side include the Reynolds number, Prandtl number, viscosity ratio and pitch ratio. The new design correlations are benchmarked in two steps. In the first step, the outlet temperatures on the tube side and shell side are predicted and compared with the experimental data. The results clearly support the robustness of the correlations. In the second step, a full analysis is carried out using the new correlations for the design of a heat exchanger from the ground up in order to predict the necessary length of the bundle. The new correlations not only predict the bundle length successfully in comparison to the tested heat exchangers, but also show that a reduction in tube length is achievable in comparison to that predicted by the existing heat transfer correlations.

All are welcome, and MNE students are encouraged to attend.

For more information please contact Dr. Ray Laoulache (rlaoulache@umassd.edu, 508-999-8540).

Thank you!


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