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Experimental comparative study of straight and loop wickless heat pipes with rectangular evaporator and water cooled condenser

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Abstract

A comparative study has been experimentally carried out between two types of wickless heat pipes, namely; the Straight Type (ST) and the Loop Type (LT). The geometry and dimensions of evaporator and condenser in one system are identical to their counterparts in the other system. An evaporator with rectangular shape (10 × 10 × 3) cm was employed and equipped with a flat-type heating element at the bottom. The condenser takes the form of straight vertical tube (1.5 cm diameter, 15 cm length) and is cooled by an annular water jacket. Tests were carried out to evaluate thermal performance of both types for ten values of input power from 10 to 100 W. Four fill ratios were considered, namely; 15%, 25%, 50% and 85%. Results showed that the LT is more efficient than the ST in dissipating the heater power. The maximum value of wall temperature in evaporator was 95 °C in LT compared with 115 °C in ST, both at 100 W input power and 15% fill ratio. The fill ratio of 50% gave the minimum values of wall temperature for the whole range of tested input power. The maximum value of the total thermal resistance in LT was 0.68 °C/W at an input power 10 W and a fill ratio of 15%, while it was 0.82 °C/W for ST at 100 W input power and 85% fill ratio.

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Abbreviations

Ae :

Evaporator bottom area m2

Cpw :

Water specific heat J/(kg °C)

he :

Evaporator heat transfer coefficient W/(m2 °C)

LT:

Loop type

ṁw :

Cooling water mass flow rate kg/s

Qevap :

Evaporator input power W

Qcond :

Condenser rejected power W

Revap :

Evaporator thermal resistance °C/W

Rcond :

Condenser thermal resistance °C/W

Rtotal :

System total thermal resistance °C/W

ST:

Straight type

Tin :

Cooling water inlet temperature °C

Tout :

Cooling water outlet temperature °C

Tw :

Evaporator average wall temperature °C

Twc :

Condenser wall temperature °C

Tsat :

Saturation temperature °C

References

  1. Reay DA, Kew PA (2006) Heat Pipes: Theory. Butterworth-Heinemann, Design and Applications. Fifth Edit

    Google Scholar 

  2. Payakaruk T, Terdtoon P, Ritthidech S (2000) Correlations to Predict Heat Transfer Characteristics of an Inclined Closed Two-Phase Thermosyphon at Normal Operating Conditions. Appl Therm Eng 20(9):781–790

    Article  Google Scholar 

  3. Park YJ, Kang HK, Kim CJ (2002) Heat Transfer Characteristics of a Two-Phase Closed Thermosyphon to the Fill Charge Ratio. Int J Heat Mass Transf 45(23):4655–4661

    Article  Google Scholar 

  4. Jiao B, Qiu LM, Zhang XB, Zhang Y (2008) Investigation on the Effect of Filling Ratio on the Steady-State Heat Transfer Performance of a Vertical Two-Phase Closed Thermosyphon. Appl Therm Eng 28(11–12):1417–1426

    Article  Google Scholar 

  5. Jouhara H, Robinson AJ (2010) Experimental Investigation of Small Diameter Two-Phase Closed Thermosyphons Charged with Water, FC-84, FC-77 and FC-3283. Appl Therm Eng 30(2–3):201–211

    Article  Google Scholar 

  6. Alizadehdakhel A, Rahimi M, Alsairafi AA (2010) CFD Modeling of Flow and Heat Transfer in a Thermosyphon. Int Commun Heat Mass Transfer 37(3):312–318

    Article  Google Scholar 

  7. Jouhara H, Ajji Z, Koudsi Y, Ezzuddin H, Mousa N (2013) Experimental Investigation of an Inclined-Condenser Wickless Heat Pipe Charged with Water and an Ethanol-Water Azeotropic Mixture. Energy 61:139–147

    Article  Google Scholar 

  8. Solomon A, Brusly RR, Walter Vincent VK, Karthikeyan L, Godson A (2015) Heat Transfer Performance of an Anodized Two-Phase Closed Thermosyphon with Refrigerant as Working Fluid. Int J Heat Mass Transf 82:521–529

    Article  Google Scholar 

  9. Alammar AA, Al-Dadah RK, Mahmoud SM (2016) Numerical Investigation of Effect of Fill Ratio and Inclination Angle on a Thermosiphon Heat Pipe Thermal Performance. Appl Therm Eng 108:1055–1065

    Article  Google Scholar 

  10. Eidan AA, Najim SE, Jalil JM (2016) Experimental and Numerical Investigation of Thermosyphone Performance in HVAC System Applications. Heat and Mass Transfer/Waerme- Und Stoffuebertragung 52(12):2879–2893

    Article  Google Scholar 

  11. Andrzejczyk R (2019) “Experimental Investigation of the Thermal Performance of a Wickless Heat Pipe Operating with Different Fluids: Water, Ethanol, and SES36. Analysis of Influences of Instability Processes at Working Operation Parameters.” Energies 12(1)

  12. Na MK, Jeon JS, Kwak HY, Nam SS (2001) Experimental Study on Closed-Loop Two-Phase Thermosyphon Devices for Cooling MCMs. Heat Transfer Eng 22(2):29–39

    Article  Google Scholar 

  13. Haider SI, Joshi YK, Nakayama W (2002) A Natural Circulation Model of the Closed Loop, Two-Phase Thermosyphon for Electronics Cooling. J Heat Transfer 124(5):881–890

    Article  Google Scholar 

  14. Khodabandeh R (2004) Thermal Performance of a Closed Advanced Two-Phase Thermosyphon Loop for Cooling of Radio Base Stations at Different Operating Conditions. Appl Therm Eng 24(17–18):2643–2655

    Article  Google Scholar 

  15. Gima S, Nagata T, Zhang X, Fujii M (2005) Experimental Study on CPU Cooling System of Closed-Loop Two-Phase Thermosyphon. Heat Transfer - Asian Research 34(3):147–159

    Article  Google Scholar 

  16. Franco A, Filippeschi S (2012) Closed Loop Two-Phase Thermosyphon of Small Dimensions: A Review of the Experimental Results. Microgravity Sci Technol 24(3):165–179

    Article  Google Scholar 

  17. Anand AR, Jaiswal A, Ambirajan A, Dutta P (2018) Experimental Studies on a Miniature Loop Heat Pipe with Flat Evaporator with Various Working Fluids. Appl Therm Eng 144(August):495–503

    Article  Google Scholar 

  18. Liu L, Xiaoping Y, Bo Y, Xinyu J, Jinjia W (2020) “Experimental Study on Thermal Performance of a Loop Heat Pipe with a Bypass Line.” Intern J Heat Mass Trans 147:118996

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Authors and Affiliations

  1. College of Engineering, Mechanical Engineering Department, Al-Mustansiriyah University, Baghdad, Iraq

    Samah E. Al-Sa’di, Aouf A. Al-Tabbakh & Adnan A. Abdulrasool

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  1. Samah E. Al-Sa’di
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  2. Aouf A. Al-Tabbakh
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  3. Adnan A. Abdulrasool
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Correspondence to Aouf A. Al-Tabbakh.

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Al-Sa’di, S.E., Al-Tabbakh, A.A. & Abdulrasool, A.A. Experimental comparative study of straight and loop wickless heat pipes with rectangular evaporator and water cooled condenser. Heat Mass Transfer 58, 695–705 (2022). https://doi.org/10.1007/s00231-021-03119-5

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