In the present study, hybrid nanofluids with different volume ratio between silver and Al2O3 were used as working fluids of a grooved heat pipe(GHP). Various parameters such as volume concentration of nano particle, orientation, heat flux, and cooling media were investigated with nanofluidic grooved...
In the present study, hybrid nanofluids with different volume ratio between silver and Al2O3 were used as working fluids of a grooved heat pipe(GHP). Various parameters such as volume concentration of nano particle, orientation, heat flux, and cooling media were investigated with nanofluidic grooved heat pipe. Specially, the present experimental results of hybrid nanofluids were compared with that of pure water. In the present study, the used nanofluid with silver(15nm nanoparticles)/Al2O3(85nm) were dispersed into pure water with each of cross blended concentrations of 0.005%, 0.05%, 0.1%. The specially designed grooved heat pipe charged with nanofluids was investigated in terms of various parameters such as heat transfer rate(50～300W with 50 W interval), volume concentration(0.005%, 0.05%, 0.1%, and hybrid combinations), geometry(5°, 45°, 90°), cooling water(1℃, 10℃, 20℃), surface state, transient state and so on. In case of Ag-nanofluid, the best heat transfer performance was observed in the concentration of 0.1%. For Al2O3, the best was observed in the concentration of 0.005% Serious temperature fluctuation of GHP(groove heat pipe) with fixed suppllied heat of 50 W was observed. The best operation state with nanofluidic GHP was observed in the 5° inclination. Increasing cooling medium temperature in the condenser section raised directly the heater temperature. After boiling of nanofluids, the heat pipe inner surface was observed with SEM photo. The surface state in each operating positions(evaporator, adiabatic, and condenser section) was different from the deposition rate. GHP with hybrid nanofluids does not showed the great improvement of the performance. But with increasing concentration of metallic silver particle, the GHP system was much active flow dynamics in terms of temperature profile.
In the present study, hybrid nanofluids with different volume ratio between silver and Al2O3 were used as working fluids of a grooved heat pipe(GHP). Various parameters such as volume concentration of nano particle, orientation, heat flux, and cooling media were investigated with nanofluidic grooved heat pipe. Specially, the present experimental results of hybrid nanofluids were compared with that of pure water. In the present study, the used nanofluid with silver(15nm nanoparticles)/Al2O3(85nm) were dispersed into pure water with each of cross blended concentrations of 0.005%, 0.05%, 0.1%. The specially designed grooved heat pipe charged with nanofluids was investigated in terms of various parameters such as heat transfer rate(50～300W with 50 W interval), volume concentration(0.005%, 0.05%, 0.1%, and hybrid combinations), geometry(5°, 45°, 90°), cooling water(1℃, 10℃, 20℃), surface state, transient state and so on. In case of Ag-nanofluid, the best heat transfer performance was observed in the concentration of 0.1%. For Al2O3, the best was observed in the concentration of 0.005% Serious temperature fluctuation of GHP(groove heat pipe) with fixed suppllied heat of 50 W was observed. The best operation state with nanofluidic GHP was observed in the 5° inclination. Increasing cooling medium temperature in the condenser section raised directly the heater temperature. After boiling of nanofluids, the heat pipe inner surface was observed with SEM photo. The surface state in each operating positions(evaporator, adiabatic, and condenser section) was different from the deposition rate. GHP with hybrid nanofluids does not showed the great improvement of the performance. But with increasing concentration of metallic silver particle, the GHP system was much active flow dynamics in terms of temperature profile.
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