A numerical model for the cooling of a lava sill with heat pipe effects

2021 ◽  
Author(s):  
Kaj E. Williams ◽  
Colin M. Dundas ◽  
Laszlo P. Kestay
Keyword(s):  
Numerical Model ◽  
Heat Pipe

Thermal numerical model of a high temperature heat pipe heat exchanger under radiation

2014 ◽  
Vol 135 ◽  
pp. 586-596 ◽  
Author(s):  
Eui Guk Jung ◽  
Joon Hong Boo
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Numerical Model ◽  
Heat Pipe ◽  
Temperature Heat ◽  
High Temperature Heat Pipe ◽  
Pipe Heat

Amplification of the Thermocapillary Convection during Evapo-Condensation Cycle in Heat Pipes

2007 ◽  
Vol 553 ◽  
pp. 209-214
Author(s):  
Rachid Bennacer ◽  
Mohammed El Ganaoui
Keyword(s):  
Thermal Analysis ◽  
Numerical Model ◽  
Heat Pipe ◽  
Thermocapillary Convection ◽  
Thermal Conditions ◽  
Heat Pipes ◽  
External Conditions ◽  
Local Coupling

The control of a process dealing with heat pipe exploitation needs the thermal analysis of the evaporation-condensation cycle and noticeably the imposed external conditions (in instance modeling the heating). In this work a numerical model has been developed to describe the local coupling near the liquid/vapour interface. Simulations exhibits and quantify the response of the capillary motion to the thermal conditions.

scholarly journals Numerical Model of Heat Pipes as an Optimization Method of Heat Exchangers

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7647
Author(s):  
Łukasz Adrian ◽  
Szymon Szufa ◽  
Piotr Piersa ◽  
Filip Mikołajczyk
Keyword(s):  
Numerical Model ◽  
Heat Pipe ◽  
Heat Exchangers ◽  
Numerical Models ◽  
Heat Pipes ◽  
Primary Energy ◽  
Low Energy ◽  
New Findings ◽  
Intensification Of Heat Exchange ◽  
Building Engineering

This paper presents research results on heat pipe numerical models as optimization of heat pipe heat exchangers for intensification of heat exchange processes and the creation of heat exchangers with high efficiency while reducing their dimensions. This work and results will allow for the extension of their application in passive and low-energy construction. New findings will provide a broader understanding of how heat pipes work and discover their potential to intensify heat transfer processes, heat recovery and the development of low-energy building engineering. The need to conduct research and analyses on the subject of this study is conditioned by the need to save primary energy in both construction engineering and industry. The need to save primary energy and reduce emissions of carbon dioxide and other pollutants has been imposed on the EU Member States through multiple directives and regulations. The presented numerical model of the heat pipe and the results of computer simulations are identical to the experimental results for all tested heat pipe geometries, the presented working factors and their best degrees of filling.

Transient Performance of Heat Pipes Using Nanofluids

2020 ◽  
Author(s):  
Mahboobe Mahdavi ◽  
Amir Faghri
Keyword(s):  
Numerical Model ◽  
Pressure Drop ◽  
Response Time ◽  
Thermal Resistance ◽  
Heat Pipe ◽  
Volume Concentration ◽  
Heat Pipes ◽  
Operating Conditions ◽  
Vapor Flow ◽  
Transient Performance

Abstract In the present works, a comprehensive transient numerical model was developed to evaluate the effect of nanofluid on the transient performance of heat pipes. The numerical model solves for compressible vapor flow, the liquid flow in the wick region, and the energy equations in the vapor, wick and wall. The distinctive feature of the model is that it can uniquely determine the heat pipe operating pressure based on the physical and operating conditions of the system. Three nanoparticle types were considered: Al2O3, CuO, and TiO2. The effects of the concentration of nanoparticles (5%, 10%, 20% and 40%) were investigated on the heat pipe response time, thermal resistance, and pressure drop under various operating conditions. The results showed that the use of nanofluid decreased the response time of the heat pipe by the maximum of 27%. It was also discovered that the thermal resistance decreased significantly with an increase in the volume concentration. A maximum reduction of 84%, 82% and 78% in thermal resistance was obtained for Al2O3, CuO, and TiO2, respectively. In addition, the effect of nanoparticles on the liquid pressure drop highly depends on the nanoparticle type and volume concentration.

Numerical Analysis of Heat Pipe Turbine Vane Cooling

1998 ◽  
Vol 120 (4) ◽  
pp. 735-743 ◽  
Author(s):  
Z. J. Zuo ◽  
A. Faghri ◽  
L. Langston
Keyword(s):  
Numerical Model ◽  
Heat Pipe ◽  
Solution Method ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Curvilinear Coordinates ◽  
Vapor Flow ◽  
Transient Performance ◽  
Turbine Engine ◽  
Turbine Vane

A numerical model was developed to simulate transient performance of a heat pipe turbine vane under typical gas turbine engine conditions. Curvilinear coordinates were used to describe the three-dimensional wall and wick heat conduction coupled with the quasi-one-dimensional vapor flow. A unique numerical procedure including two iterative “estimate-correction” processes was proposed to efficiently solve the governing equations along with the boundary conditions. Comparisons with experimental results validated the numerical model and the solution method. A detailed numerical simulation of the heat pipe vane’s transient performance indicated the benefits of incorporating heat pipe vane cooling as well as the areas where precautions should be taken while designing heat pipe vanes.

Effect of Geometrical Parameters on the Thermal Performance of Ammonia-Based Trapezoidal-Shaped Axial Grooved Heat Pipe

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Akshaykumar N. Desai ◽  
V. K. Singh ◽  
Rajesh N. Patel
Keyword(s):  
Numerical Model ◽  
Heat Pipe ◽  
Inclination Angle ◽  
Interfacial Shear ◽  
Geometrical Parameters ◽  
Shear Stresses ◽  
Total Thermal Resistance ◽  
Maximum Heat ◽  
Transportation Capacity ◽  
Layer Resistance

Abstract Liquid–vapor interfacial shear stresses, contact angle, and thin-film resistance are incorporated in the present numerical model of the axial grooved heat pipe (AGHP). Experiments are performed to validate the numerical model, which predicts maximum heat transportation capacity (Qmax) within 2.5% error. Further, a parametric study is performed using maximum heat transportation capacity (Qmax) and total thermal resistance (Rtotal) as an objective function and geometrical parameters of groove (i.e., height of grooves (hg), number of grooves (N), and groove inclination angle (2υ)) as variables. From the numerical results, it is observed that number of grooves (N) and groove inclination angle (2υ) are inversely proportional to Rtotal as desired. Therefore, an increase in N and 2υ results into reduction in Rtotal. However, an increment in hg increases Rtotal due to liquid layer resistance into the grooves. Study is aimed to determine such a combination of variable which can maximize Qmax and minimize Rtotal. For ammonia based AGHP of 10.5 mm ID, 12.7 mm OD, and 1 m length, the best combination is determined as hg = 1.3 mm, N = 28 and 2υ = 76 deg, which gives Qmax and Rtotal as 109 W and 0.093 K/W, respectively.

Modeling and Thermal Optimization of a Micro Heat Pipe With Curved Triangular Grooves

2003 ◽  
Author(s):  
Kyu Hyung Do ◽  
Sung Jin Kim ◽  
Gunn Hwang
Keyword(s):  
Numerical Model ◽  
Heat Pipe ◽  
Heat Transport ◽  
Interfacial Shear Stress ◽  
Axial Direction ◽  
Transport Rate ◽  
Maximum Heat ◽  
Steady State Condition ◽  
Thermal Optimization ◽  
Micro Heat Pipe

Heat transfer and fluid flow characteristics in a micro heat pipe with curved triangular grooves are investigated using numerical and experimental methods. In the numerical part, a one-dimensional mathematical model for micro heat pipe with curved triangular grooves is developed and solved to obtain the maximum heat transport rate, the capillary radius distribution, the liquid and the vapor pressure distributions along the axial direction of the micro heat pipe under the steady-state condition. In particular, the modified Shah method is applied to calculate the pressure drop induced by the liquid-vapor interfacial shear stress. Experiments are conducted to validate the numerical model. In the experiments, the micro heat pipe with 0.56 mm in hydraulic diameter and 50 mm in length is tested. The experimental results for the maximum heat transport rate agree well with those of the numerical investigations. Finally, thermal optimization of the micro heat pipe with curved triangular grooves is performed using the numerical model.

ADVANCED ANALYSIS OF AN AMMONIA LOOP HEAT PIPE FOR SPACE APPLICATIONS. PART I: THE NUMERICAL MODEL

2013 ◽  
Vol 4 (1-2) ◽  
pp. 1-21
Author(s):  
Claudio Ferrandi ◽  
Stefano Zinna ◽  
Marco Molina ◽  
Marco Marengo
Keyword(s):  
Numerical Model ◽  
Heat Pipe ◽  
Loop Heat Pipe ◽  
Space Applications ◽  
Advanced Analysis
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