Results 151 to 160 of about 636 (201)

Heat Transport Capability in an Oscillating Heat Pipe

Journal of Heat Transfer, 2008
A mathematical model predicting the oscillating motion in an oscillating heat pipe is developed. The model considers the vapor bubble as the gas spring for the oscillating motions including effects of operating temperature, nonlinear vapor bulk modulus, and temperature difference between the evaporator and the condenser.
H. B. Ma, B. Borgmeyer, P. Cheng, Y. Zhang   +3 more
openaire   +1 more source

Wavelet Analysis of Oscillating Motions in an Oscillating Heat Pipe

Volume 10: Heat and Mass Transport Processes, Parts A and B, 2011
The heat to be removed from the electronic components or systems can be used to excite the oscillating motion of a train of liquid plugs and bubbles in the oscillating heat pipe (OHP). The oscillating motion in the OHP can significantly enhance heat transfer.
Nannan Zhao, Hongbin Ma, Xinxiang Pan
openaire   +1 more source

Cooling Performance Improvement of Heat Sink by Oscillating Heat pipe Addition and Design for Environment of Oscillating Heat Pipe Refrigerant

2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), 2018
Oscillating heat pipe addition to the heat sink was considered for the cooling performance improvement of heat sink. Hydrofluoroolefins (HFO) was chosen as the refrigerant to be encapsulated into the heat pipe, as it is nonflammable and has low global warming potential (GWP) index. HFO is proven to have the equal performance as the existing refrigerant
Kuan-Chung Tey, Kenichiro Suzuki
openaire   +1 more source

Variation in oscillating heat pipe performance

Applied Thermal Engineering, 2019
Abstract Oscillating heat pipes have been shown to be an effective means for thermal management. However, the constant, phase-change-powered oscillation can also produce variations in performance. The goal of this research is to quantify performance variation of oscillating heat pipes through repeated tests with closed-loop flat plate oscillating ...
Kimberly A Stevens
exaly   +2 more sources

Nanofluid Oscillating Heat Pipe

2015
For a typical OHP, forced convection plays a key role in the heat transfer from the evaporator to the condenser sections. In other words, most of the heat transferred from the evaporator to the condenser is by sensible heat. Thermal conductivity, viscosity, and heat capacity of the working fluid play more important roles in an OHP than the surface ...
openaire   +1 more source

Bubble generation in oscillating heat pipe

Applied Thermal Engineering, 2013
Abstract In the previous models of oscillating heat pipe (OHP), only the evaporation and condensation in the liquid–vapor interfaces were considered as phase changes. Thus, only a simple sinusoidal oscillating motion of liquid slugs and vapor plugs was produced due to the small driving force.
Raffles Senjaya, Takayoshi Inoue
openaire   +1 more source

Visualization of Oscillating Heat Pipes

2015
As described in previous chapters, fluid flow and heat transfer in an oscillating heat pipe is very complex. To better understand thermally excited oscillating flow, a number of visualization methods have been used to study fluid flow of liquid plugs and vapor bubbles in OHPs.
openaire   +1 more source

Oscillating Motion and Heat Transfer Mechanisms of Oscillating Heat Pipes

2015
An oscillating heat pipe (OHP) consists of interconnected capillary channels or tubes filled with a train of liquid plugs and vapor bubbles. An OHP typically has three sections: evaporator, adiabatic section, and condenser. When heat is added onto the evaporator section, liquid becomes vapor resulting in an increase of both vapor volume and pressure ...
openaire   +1 more source

Oscillating Characteristics of Slug Flow in Oscillating Heat Pipes

9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, 2006
Self-sustainable oscillating motions of the slug flow in oscillating heat pipes have been investigated in the paper. A mass -spring model in the adiabatic section of the heat pipe under the exciting sources in its evaporator and condenser is applied to describe the oscillating characteristics of the two-phase flow in the serpentine capillary channels ...
openaire   +1 more source

A Mathematical Model of an Oscillating Heat Pipe

Heat Transfer Engineering, 2011
A mathematical model predicting the oscillating motion in an oscillating heat pipe is developed. The model considers the system multidegree oscillation of vapor bubbles and liquid plugs, including the effects of filling ratio, operating temperature, gravitational force, and temperature difference between the evaporator and condenser.
Peng Cheng, Hongbin Ma
openaire   +1 more source