Heat Generation in Thermoplastic Spur Gears

1985 ◽  
Vol 107 (1) ◽  
pp. 31-36 ◽  
Author(s):  
D. Koffi ◽  
R. Gauvin ◽  
H. Yelle
Keyword(s):  
Heat Generation ◽  
Reasonable Agreement ◽  
Simplified Model ◽  
Temperature Sensitive ◽  
Spur Gears ◽  
Theoretical Line ◽  
Usual Case

Since thermoplastics are temperature-sensitive materials, heat generation in running spur gears is an important parameter. This paper presents two models for its evaluation, an exact one which considers all the parameters but needs a computer to solve the equations; then a simplified model. Both models take into account the contact outside the theoretical line of action which is the usual case with thermoplastic gears. Results for the simplified model are within reasonable agreement with the exact one.

Thermal Aspects of Grinding: The Case of Upgrinding

1999 ◽  
Vol 122 (4) ◽  
pp. 605-611 ◽  
Author(s):  
Marios D. Demetriou ◽  
Adrienne S. Lavine
Keyword(s):  
Experimental Data ◽  
Heat Generation ◽  
Opposite Direction ◽  
Thermal Model ◽  
Reasonable Agreement ◽  
Workpiece Temperature ◽  
Conventional Grinding

Conventional grinding is usually carried out in upgrinding mode, with the wheel moving in the opposite direction from the workpiece. In this paper, a thermal model is developed for upgrinding. This model is similar to our previous models of downgrinding in that the behavior of the workpiece, grains, fluid, and chips are all coupled. The model is used to compare the workpiece temperature rises in upgrinding and downgrinding, and to explore the effect of the location of heat generation. The model results are also compared with experimental data and are seen to yield reasonable agreement. Finally, the sensitivity of the results to some parameters which are not well known is explored. [S1087-1357(00)01002-9]

Simplified model for polyurethane foaming in porous media

2017 ◽  
Vol 27 (1) ◽  
pp. 142-155 ◽  
Author(s):  
Hani Sadrhosseini ◽  
Saed Bazkhane
Keyword(s):  
Temperature Distribution ◽  
Heat Generation ◽  
Energy Equation ◽  
Simplified Model ◽  
Injection Velocity ◽  
Growth Ratio ◽  
Content Type ◽  
Generation Function ◽  
Solid Liquid Interface ◽  
Polyurethane Foaming

Purpose The purpose of the study is to present a simplified model to replace the complicated foaming simulations for investigating the liquid polyurethane behavior just before solidification. Design/methodology/approach This model is inspired from the traveling heater method of crystallization because of the low injection velocity. Besides, the heat generated during the reaction is considered as a heat source function in the energy equation. Findings Various distributions of the heat generation function inside the geometry have been studied to choose the most realistic one. Effect of parameters such as the soil material and porosity on the temperature distribution and flow field are examined for different values of heat flux on the boundaries. Results show an almost linear dependency of pressure drop to the velocity, a uniform velocity profile and an expected temperature distribution compared to literature, which approves the suggested model. Originality/value A new model is presented in this study for foaming which replaces a heat generation function (exponential) in the source term of the energy equation instead of the heat produced at the exit boundary (the solid–liquid interface), and the traveling method is used instead of moving the geometry; besides, the growth ratio has been neglected; therefore, this model has been validated by a foaming simulation to confirm the suggested simplified idea.

Penetration of tubulars into horizontal oil wells

2002 ◽  
Vol 216 (12) ◽  
pp. 1237-1245 ◽  
Author(s):  
I McCourt ◽  
T Truslove ◽  
J Kubie
Keyword(s):  
Experimental Data ◽  
Reasonable Agreement ◽  
Small Diameter ◽  
Oil Wells ◽  
Simplified Model ◽  
Straight Section ◽  
Frictional Forces

Penetration of tubulars into horizontal oil wells is investigated in this work. Locking of the tubulars by frictional forces alone is modelled by inserting small diameter rubber rods into horizontal acrylic tubes. Three different regions of the penetrating rod are described: the initial straight section, followed by sinusoidal deformations with gradually decreasing lengths and increasing amplitudes, which finally develop into helical deformations with subsequent lock-up. The effect of the insertion velocity is also investigated. A simplified model is developed, which is in reasonable agreement with experimental data.

Sign in / Sign up

Export Citation Format

Share Document