Heat Pipe and Thermosyphon for Thermal Management of Thermoelectric Cooling

Alves, Thiago Antonini; Krambeck, Larissa; dosSantos, Paulo H. Dias

doi:10.5772/intechopen.76289

Cited by 10 publications

(13 citation statements)

References 19 publications

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“…The accuracy of T‐type thermocouple is assumed to be ±1°C. The uncertainty of temperature is expressed by Alves et al 19

u false(T false) = \frac{\pm 1}{\sqrt{3}} = 0.577 normal° normalC,

where u is the uncertainty of measurement quantity. The uncertainty in the condenser is given by the first‐order Taylor series approximation (law of prorogation of uncertainty) by Gorecki 20

u^{2} false(Q_{c} false) = {(\frac{\partial Q_{normalc}}{\partial m})}^{2} u^{2} false(m false) + {(\frac{\partial Q_{normalc}}{\partial T_{normali}})}^{2} u^{2} false(T_{i} false) + {(\frac{\partial Q_{normalc}}{\partial T_{normalo}})}^{2} u^{2} false(T_{o} false) .

…”

Section: Methodsmentioning

confidence: 99%

“…The accuracy of T-type thermocouple is assumed to be ±1°C. The uncertainty of temperature is expressed by Alves et al 19 u T…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…The uncertainties associated with the heater and mass flow rate are considered as ±2% and ±3.5%, respectively. [19][20][21] The uncertainty associated with the first law efficiency or energy efficiency is given by…”

Section: Parameter Rangementioning

confidence: 99%

“…where C p is a velocity of the fluid (J/kg The Nusselt number is given by the expression Nu hL k = . (19) In this expression, L is a characteristic length (m); k and h are thermal conductivity (W/ m•K) and heat transfer coefficient (W/m 2 •K), respectively. [37][38][39] The basic dimensional parameters and their fundamental dimensions are given in Table 6.…”

Section: The Reynolds Number Is Given By the Expressionmentioning

confidence: 99%

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Effect of adiabatic length on the performance of closed‐loop thermosyphon system

Birajdar

Sewatkar

2020

Heat Trans

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This paper reports the effect of different adiabatic lengths on the thermal performance of loop thermosyphon with different filling ratios (FRs) and heat inputs. The carbon steel thermosyphon loop for three different adiabatic lengths is used in this analysis. The loop with plate-type, forced air-cooled condenser, along with two vertical inline evaporators, is filled and tested with distilled water. The transient and steady-state analyses are carried out to understand the thermal behavior of the loop. The thermal resistance is found to be lowest at 800-mm adiabatic length and 60% FR. The geyser boiling phenomenon is also noticed in the present thermosyphon loop. The period of oscillation and temperature fluctuations in the evaporator and condenser increase with the adiabatic length. The geyser boiling phenomenon may disappear at a very small adiabatic length of the loop thermosyphon with forced air-cooled condenser. This paper proposes a mathematical model for the loop thermosyphon in terms of the Nusselt number, the Reynolds number, the Prandtl number, and the adiabatic length-todiameter ratio, and the comparative study shows that proposed model validates the experimental results. Also, it is found that the adiabatic length-to-diameter ratio inversely varies with the Nusselt number.

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“…The accuracy of T‐type thermocouple is assumed to be ±1°C. The uncertainty of temperature is expressed by Alves et al 19

u false(T false) = \frac{\pm 1}{\sqrt{3}} = 0.577 normal° normalC,

where u is the uncertainty of measurement quantity. The uncertainty in the condenser is given by the first‐order Taylor series approximation (law of prorogation of uncertainty) by Gorecki 20

u^{2} false(Q_{c} false) = {(\frac{\partial Q_{normalc}}{\partial m})}^{2} u^{2} false(m false) + {(\frac{\partial Q_{normalc}}{\partial T_{normali}})}^{2} u^{2} false(T_{i} false) + {(\frac{\partial Q_{normalc}}{\partial T_{normalo}})}^{2} u^{2} false(T_{o} false) .

…”

Section: Methodsmentioning

confidence: 99%

“…The accuracy of T-type thermocouple is assumed to be ±1°C. The uncertainty of temperature is expressed by Alves et al 19 u T…”

Section: Uncertainty Analysismentioning

confidence: 99%

Section: Parameter Rangementioning

confidence: 99%

Section: The Reynolds Number Is Given By the Expressionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of adiabatic length on the performance of closed‐loop thermosyphon system

Birajdar

Sewatkar

2020

Heat Trans

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“…The methodology for the manufacturing (i.e., cleaning, assembly, tightness test, evacuation procedure, and filling with the working fluid), testing, and analysis of the heat pipes was developed based on the work by Alves, Krambeck, and Santos (2018).…”

Section: Experimental Analysismentioning

confidence: 99%

Experimental research of capillary structure technologies for heat pipes

et al. 2020

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This paper presents an experimental study on three different capillary structure technologies of heat pipes for application in the thermal management of electronic packaging. The first capillary structure is that of axial grooves manufactured by wire electrical discharge machining (wire-EDM). The sintering process with copper powder produced the second heat pipe. Finally, a hybrid heat pipe was made by the combination of the two previous methods. The heat pipes were produced using copper tubes with an outer diameter of 9.45 mm and a length of 200 mm, and were tested horizontally at increasing heat loads varying from 5 to 35 W. The working fluid used was distilled water. The experimental results showed that all capillary structures for heat pipes worked successfully, so the studied manufacturing methods are suitable. Nonetheless, the hybrid heat pipe is the best, due to the lowest thermal resistance presented.

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A review of thermal interface material fabrication method toward enhancing heat dissipation

et al. 2020

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Summary Thermal interface materials (TIMs) are applied in electronic devices that are involved in heat generation and raising the temperature. The optimization of TIMs is important in heat dissipation to maintain the good performance of devices, low power during operation, and reduced internal damages among small components. The TIMs are inserted between two contact surfaces to enhance thermal conductivity that will reduce the increment of surface temperature in a longer time and facilitates the cooling process with a consistent power supplied to the system with minimum increment. Research on nanomaterials and hybrid materials aims to obtain maximum thermal conductivity and reduce resistance in the devices. However, the suitable fabrication method for achieving good production and performance is still debatable. Therefore, significant fabrication methods have been explored for various materials. This review provides insights into the current work focusing on the materials used in the development of TIMs by various methods. The discussion begins with the introduction of thermal management and the working principles applied in the system. Then, the methods applied for material fabrication into TIMs, including the advantages and disadvantages of the methods, are discussed. Last, the current challenges and opportunities in methods used are discussed to offer new inputs and improvement in method modification for TIMs design. The targeted thermal performance for the industrial market of TIMs for nanomaterial applications is approximately 100 W/mK and 1 × 10−6 m2/WK with lowest power of 100 W.

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Heat Pipe and Thermosyphon for Thermal Management of Thermoelectric Cooling

Cited by 10 publications

References 19 publications

Effect of adiabatic length on the performance of closed‐loop thermosyphon system

Effect of adiabatic length on the performance of closed‐loop thermosyphon system

Experimental research of capillary structure technologies for heat pipes

A review of thermal interface material fabrication method toward enhancing heat dissipation

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