Journal ArticleDOI
Theoretical analysis of the maximum heat transport in triangular grooves : A study of idealized micro heat pipes
G. P. Peterson,Hongbin Ma +1 more
Reads0
Chats0
TLDR
In this paper, a mathematical model for predicting the minimum meniscus radius and the maximum heat transport in triangular grooves is presented, which is based on the physical characteristics and geometry of the capillary grooves.Abstract:
A mathematical model for predicting the minimum meniscus radius and the maximum heat transport in triangular grooves is presented. In this model, a method for determining the theoretical minimum meniscus radius was developed and used to calculate the capillary heat transport limit based on the physical characteristics and geometry of the capillary grooves. A control volume technique was employed to determine the flow characteristics of the micro heat pipe, in an effort to incorporate the size and shape of the grooves and the effects of the frictional liquid-vapor interaction. In order to compare the heat transport and flow characteristics, a hydraulic diameter, which incorporated these effects, was defined and the resulting model was solved numerically. The results indicate that the heat transport capacity of micro heat pipes is strongly dependent on the apex channel angle of the liquid arteries, the contact angle of the liquid flow, the length of the heat pipe, the vapor flow velocity and characteristics, and the tilt angle. The analysis presented here provides a mechanism whereby the groove geometry can be optimized with respect to these parameters in order to obtain the maximum heat transport capacity for micro heat pipes utilizing axial grooves as the capillary structure.read more
Citations
More filters
Experimental Investigation of Micro HeatPipes Fabricated in Silicon Wafers
TL;DR: In this paper, the thermal behavior of arrays of micro heat pipes fabricated in silicon wafers was investigated using an infrared thermal imaging unit, the temperature gradients and maximum localized temperatures were measured and an effective thermal conductivity was computed.
Journal ArticleDOI
Temperature Variation and Heat Transfer in Triangular Grooves with an Evaporating Film
Hongbin Ma,G. P. Peterson +1 more
TL;DR: In this article, a mathematical model for the evaporating heat transfer coefe cient and temperature variation along the axial direction of a grooved plate has been developed, which includes the effects of the capillaryinduced e ow in the grooves caused by the surface tension, the two-dimensional heat conduction occurring in the wall and liquid e lm, and the e ow and evaporation of the thin e llm caused by disjoining pressure and surface tension in the thin E lm region.
Journal ArticleDOI
Heat utilisation technologies: A critical review of heat pipes
Abstract: In electrical or thermal appliances, heat (thermal energy) must either be added into or removed from a system to maintain operational stability. Heat pipes can enhance the heat transfer capabilities without needing a significant temperature gradient between heat sources and heat sinks. The effectiveness of heat pipes is due to the latent heat of phase change of the working fluid within (i) condensation and (ii) evaporation stages. The latent heat of phase change greatly exceeds the sensible heat capacity. Heat pipes may rely on gravity, wicks, centrifugal force or in some cases even a magnetic field to help return condensate flow from the condenser to the evaporator. Wicks in heat pipes are classified into three groups: sintered, groove and mesh types. This review attempts to cover various types of heat pipes such as thermal diodes, variable conductance, pulsating, etc. The application of nanotechnology in heat pipes can be separated into two groups: nanoparticles and nanobubbles, with the latter receiving considerably less attention than the former. The hybridisation of heat pipe technology is also possible and has been discussed along with its future research potential.
Journal ArticleDOI
A review and comparative study of the investigations on micro heat pipes
TL;DR: A review of recent investigations on micro heat pipes of various geometrical designs, fabrication methods, operational environments and applications is presented, along with a comparative analysis of the performance of various designs, based on quantitative design parameters and performance indicators as discussed by the authors.
References
More filters
Book
An Introduction to Heat Pipes: Modeling, Testing, and Applications
TL;DR: In this article, the authors present a model for modeling heat pipe performance based on the properties of heat pipes and their properties in the electronics industry, including their properties and properties in terms of testing and analysis.
Journal ArticleDOI
Steady-State Modeling and Testing of a Micro Heat Pipe
B. R. Babin,G. P. Peterson,D. Wu +2 more
Journal ArticleDOI
Thermal Analysis of a Micro Heat Pipe
D. Khrustalev,Amir Faghri +1 more
TL;DR: In this paper, a detailed mathematical model was developed in which the heat and mass transfer processes in a micro heat pipe (MHP) were examined and the importance of the liquid fill, minimum wetting contact angle, and the shear stresses at the liquid-vapor interface in predicting the maximum heat transfer capacity and thermal resistance of the MHP was demonstrated.