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Lehigh University

1969

Mechanical Engineering

Articles 1 - 10 of 10

Full-Text Articles in Engineering

An Experimental Investigation Of A Water Heat Pipe, Nathan Kalowski Jan 1969

An Experimental Investigation Of A Water Heat Pipe, Nathan Kalowski

Theses and Dissertations

A stainless steel water heat pipe instrumented with external surface thermocouples, internal thermocouples and pressure gages was designed, built, and operated. The operating condition of the heat pipe was controlled by manipulation of a resistance heater in the evaporator section an anannulus type water cooling jacket in the condenser section.


A Study Of Simulated Boiling In Vertical Upward And Downward Flow, Chandrakant V. Mahale Jan 1969

A Study Of Simulated Boiling In Vertical Upward And Downward Flow, Chandrakant V. Mahale

Theses and Dissertations

An investigation of the distribution of air and water in the upflow tube, U-bend and downflow tube of a two phase flow apparatus is presented here with the help of experimental results and photographs. Isokinetic and sampling probes were used to sample the flow. Probing was done at the centres and at the beginning of the upflow and downflow tubes.


Spread In Flat Rolling, Richard D. Way Jan 1969

Spread In Flat Rolling, Richard D. Way

Theses and Dissertations

A velocity field was derived for a flat workpiece undergoing plastic deformation between cylindrical rolls in a rolling mill. Using the velocity field, an expression was written for the total power input required for the rolling process in terms of the process parameters: roll diameter, thickness reduction, workpiece geometry, surface friction, and spread. The Upper Bound Theorem was applied to the power expression to establish an upper limit on it. This limit was minimized with respect to spread to determine the value of spread requiring the least amount of input power.


Determination Of Radiation View Factors In A Cement Kiln Using Numerical Integration, Jerry Lee Wagner Jan 1969

Determination Of Radiation View Factors In A Cement Kiln Using Numerical Integration, Jerry Lee Wagner

Theses and Dissertations

Radiation is the major mode of heat transfer to the charge in a cement kiln. Four types of radiation are present: 1- surface to surface, 2- surface to gas, 3- gas to surface, and 4- gas to gas. As such four corresponding view factors must be determined. One can determine these view factors if the gas space in the enclosure and the boundary walls are divided into zones.


An Experimental Method For Determining Cutting Forces, Kiran M. Gandhi Jan 1969

An Experimental Method For Determining Cutting Forces, Kiran M. Gandhi

Theses and Dissertations

The prediction of the force required to cut a material has been one of the central problems of interest in metal cutting. Many theories have been presented, but because of their predictive inaccuracies, they have rendered themselves wholly unacceptable for practical use. In this thesis an empirical method of predicting the forces produced during cutting is developed for SAE 1117, CRS, SAE 4145 HRS and SSE 6150 HRS materials. The same type of empirical method is also presented to predict cutting forces for any type of steel by knowing its ultimate shear strength. This can be used to predict the ...


Boiling Heat Transfer In Vertical Upflow And Downflow Tubes Using A Multicomponent Fluid, James P. Quaile Jan 1969

Boiling Heat Transfer In Vertical Upflow And Downflow Tubes Using A Multicomponent Fluid, James P. Quaile

Theses and Dissertations

Non-boiling and boiling heat transfer experiments were conducted in vertical tubes using Varsol, a hydro-carbon mixture. A computer program was developed to perform data recudtion analysis and is presented in the appendix.


Moving Cracks In A Finite Strip Under Longitudinal Shear, Tony Er-Ping Chen Jan 1969

Moving Cracks In A Finite Strip Under Longitudinal Shear, Tony Er-Ping Chen

Theses and Dissertations

Investigated is the anti-plane stress distribution around a semi-infinite crack traveling with constant velocity in an infinitely long strip of finite width. The problem is reduced to the solution of the Hilbert problem of the half plane by the application of the Schwarz-Christoffel conformal transformation and the theory of complex functions.


An Experimental Investigation Of The Velocity And Heat Generation Characteristics Of A Fixed Boundary Fracture Model, Thomas L. Paxson Jan 1969

An Experimental Investigation Of The Velocity And Heat Generation Characteristics Of A Fixed Boundary Fracture Model, Thomas L. Paxson

Theses and Dissertations

An experimental investigation of the fracture velocity characteristics of a quasi-brittle material under fixed boundary conditions has been conducted. In addition, an apparatus to measure the heat generated by a quai-static, propagating crack has been designed.


A Compressible And Incompressible Flow Analysis Of The Air-Lift Pump, Kenneth A. Schoeneck Jan 1969

A Compressible And Incompressible Flow Analysis Of The Air-Lift Pump, Kenneth A. Schoeneck

Theses and Dissertations

The operation of an air-lift pump, 14 ft. high and 2" in diameter, has been studied. The results show that a present theory based on incompressible flow and including the effects of friction and slip between the gas and liquid accurately predicts the performance characteristics of these devices in shallow submergence applications. Measurement of two-phase friction and slip have been made and correlations are presented.


Redesign Of A Water Table For Study Of Unsteady Flow In Turbines, Robert M. Ickes Jan 1969

Redesign Of A Water Table For Study Of Unsteady Flow In Turbines, Robert M. Ickes

Theses and Dissertations

The work undertaken in this thesis involved the improvement of existing equipment for the study of unsteady flow in gas and steam turbines through experiments carried out with a water analogue. some of the phenomena studied were pressure waves generated by the turbine blades as they pass the nozzles, vortices formed by the flow leaving the nozzles, and separation from the suction side of the blades.