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Full-Text Articles in Mechanical Engineering

Laser Cutting Of Eggshells, Palaniappa A. Molian, Jerry L. Hall, M. J. Hsu Feb 1994

Laser Cutting Of Eggshells, Palaniappa A. Molian, Jerry L. Hall, M. J. Hsu

Iowa State University Patents

Preparation of chicken embryo allantoic fluids for animal health requires opening the eggshell by cutting, drilling or punching methods. Laser cutting and drilling is used as an alternative to known processes. Both CO.sub.2 and Nd:YAG lasers are employed. A focused CO.sub.2 laser beam at a power of 200 watts in conjunction with an X-Y motion table produced 25 mm diameter "clean-cuts" in eggshells with a cutting time of 0.5 seconds per egg. The material removal mechanism was vaporization. When an axicon/lens combination is used with a CO.sub.2 laser, the cutting time ...


A Study On Air Flow And Odor Emission Rate From A Simplified Manure Storage Tank , Qianbao Liu Jan 1994

A Study On Air Flow And Odor Emission Rate From A Simplified Manure Storage Tank , Qianbao Liu

Retrospective Theses and Dissertations

This study presents a numerical and experimental evaluation of air flow and odor emission rate from an open manure storage tank. The concentration at the manure surface, the tank dimensions, and wind speed were used to calculate air flow and the emission rate;The three-dimensional air flow in the open tank was divided into four segments and each segment was treated as two-dimensional. The SIMPLER algorithm developed by Patankar and a two layer turbulence model were used in the numerical simulation with a grid of 152 x 139;The predicted emission rate agreed with the field measurement results found in ...


Modelling And Evaluation Of A Cistern-Based Ground-Coupled Heat Pump: Its Implications In Reducing Energy In A Commercial Swine Operation , James D. Leary Jan 1994

Modelling And Evaluation Of A Cistern-Based Ground-Coupled Heat Pump: Its Implications In Reducing Energy In A Commercial Swine Operation , James D. Leary

Retrospective Theses and Dissertations

This research details the analysis of a ground-coupled heat pump system which utilizes a 20,000 gallon well-water storage tank as a source of heating and cooling. It addresses the feasibility of such a system and discusses the system in terms of energy efficiency--first law conservation analysis. The potential use of this type of system for the control of sensitive thermal environments involving swine is also evaluated;The goal of this research was to investigate ISU's SNMRC heat pump system. Specific objectives were: (1) To evaluate the system in terms of heat exchanger and heat pump efficiencies. (2) To ...