Computational Analysis of Fluid Flow and Heat Transfer in Wire-Sandwiched Microheat Pipes

Rag, R. L.; Sobhan, C. B.

doi:10.2514/1.44101

Cited by 13 publications

(10 citation statements)

References 14 publications

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“…The construction, operation and analysis of wire-bonded micro heat pipe devices has been described previously in the literature (Wang and Peterson, 2002a;Wang and Peterson, 2002b;Wang et al, 2001;Peterson and Wang, 2003;Rag and Sobhan, 2009;Rag and Sobhan, 2010;Rag et al, 2018). Although micro heat pipes do not, in general contain a formal wicking structure, as is the case for more conventional heat pipes, the fundamental operating principles and performance characteristics are similar and subject to the same limitations.…”

Section: Wire-bonded Micro Heat Pipesmentioning

confidence: 99%

“…Computational studies have been conducted on wire-bonded heat pipes to analyze their performance and to obtain the operational characteristics using numerical models (Rag and Sobhan, 2009;Rag and Sobhan, 2010;Rag et al, 2018). The formulation and method of analysis used in these devices are presented here, with some typical results of the analysis.…”

Section: Preliminary Designsmentioning

confidence: 99%

“…The Hagen-Poiseuille equation is used to calculate a first approximation of the liquid pressure, which is subsequently reiterated using the liquid momentum equation. The mathematical formulation has been used to obtain the temperature and velocity distributions, as discussed in previous investigations (Rag and Sobhan, 2009;Rag and Sobhan, 2010;Rag et al, 2018). The formulation steps of the problem are listed below for completeness.…”

Section: Mathematical Modelmentioning

confidence: 99%

See 2 more Smart Citations

Investigations of Wire-Bonded Micro Heat Pipes - A Review

Peterson¹,

Sobhan²

2019

Frontiers in Heat and Mass Transfer

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Micro heat pipes have found applications in numerous types of systems where effective heat dissipation in a limited space is required. One relatively new design/fabrication methodology for parallel micro heat pipes with high performance is referred to as "wire-bonded" micro heat pipe arrays. The following review analyzes the principles of operation of these devices and investigates the recent developments in the technology, along with their fabrication and application. The results indicate that these micro heat pipe arrays present an attractive alternative for a number of interesting applications, including many that have yet to be explored.

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Section: Wire-bonded Micro Heat Pipesmentioning

confidence: 99%

Section: Preliminary Designsmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

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Investigations of Wire-Bonded Micro Heat Pipes - A Review

Peterson¹,

Sobhan²

2019

Frontiers in Heat and Mass Transfer

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“…Since then, the concept of miniaturization of heat pipes became widely accepted and a substantial number of theoretical studies [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have been undertaken over the past two decades to better understand their operational characteristics and performance limitations. In the existing literature, the operational principles, performance, feasibility, as well as fabrication methods and applications of micro heat pipes have been well documented [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of optimally designed inclined micro heat pipes with axial solid wall conduction

Hung

Tio

2012

International Communications in Heat and Mass Transfer

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“…With 50 pairs of carbon blocks, an effectiveness of 98% was reached. Rag and Sobhan [17] analyzed a micro heat pipe, with a predictive model that incorporated the longitudinal temperature variation, frictional effects and phase change during the process.…”

Section: Introductionmentioning

confidence: 99%

Time varying NTU method for heat exchanger analysis with mass discharge

2011

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Transient operation of a co-current heat exchanger is analyzed in this paper, using a new predictive formulation for laminar and turbulent flows with mass discharge from the heat exchanger. The model includes time-varying mass discharge due to pressure regulated gas outflow. The temperature variations of the working fluid, heating fluid and the wall are predicted and validated against past data. It is found that the temperature of the working fluid rises sharply to a peak and then gradually decreases over time, due to mass discharge effects. The wall temperature decreases exponentially, and the temperature of the heating fluid falls sharply, and then gradually decreases. A benchmark case of a step change in the mass flow rate of the incoming fluid is analyzed and compared against past data for validation, after which results are presented and discussed for transient step changes of the incoming mass flow rate. List of symbolsA Heat transfer area (m 2 ) C p Specific heat (kJ/kg K) f, g Functions h Heat transfer coefficient (W/m 2 K) L Length of the heat exchanger (m) m Mass (kg) m Á Mass flow rate (kg/s) N Dimensionless parameter NTU Number of transfer units Nu Nusselt number P Pressure (kPa) Pe Perimeter (m) Pr Prandtl number Re Reynolds number T Temperature (°C or K) t Time (s) t cycle Total time of the heat exchanger operation (s) x Length of a heat exchanger section (m)Greek symbols c Ratio of final and initial mass flow rates q Density (kg/m 3 ) D Difference k 1,2 Roots of characteristic equations eHeat exchanger effectiveness Superscripts * Dimensionless form 0Initial condition at t = t 0 ? Condition at t = t ?

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Computational Analysis of Fluid Flow and Heat Transfer in Wire-Sandwiched Microheat Pipes

Cited by 13 publications

References 14 publications

Investigations of Wire-Bonded Micro Heat Pipes - A Review

Investigations of Wire-Bonded Micro Heat Pipes - A Review

Thermal analysis of optimally designed inclined micro heat pipes with axial solid wall conduction

Time varying NTU method for heat exchanger analysis with mass discharge

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