Consequence of nanoparticles size on heat transfer characteristics of a radiator

Ramalingam, Senthil; Dhairiyasamy, Ratchagaraja; Govindasamy, Mohan; Muthaiah, V.M. Rajavel

doi:10.1016/j.powtec.2020.03.057

Cited by 12 publications

(1 citation statement)

References 38 publications

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“…They also found that the coolant containing 0.2% ZnO rejected 46% more heat than water. Ramalingam et al investigated the thermal performance of nanofluids containing different sizes of silicon carbide in an automobile radiator [26]. They found that the 24 nm small particles showed higher thermal performance than the 110 nm large particles.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Propylene Glycol-Water and Ethylene Glycol-Water Mixtures as Engine Coolants in a Flat-Tube Automobile Radiator

Gündem

Hoşöz

Keklik³

2021

International Journal of Automotive Science and Technology

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This study aims at evaluating and comparing the thermal performance of five different engine coolants employed in an experimental engine cooling system with a flat-tube louvered-fin automobile radiator. For this purpose, a PLC-controlled test system was set up. The system could maintain the temperatures of the air and coolant at the radiator inlet, the speed of the air and flow rate of the coolant at the required values during the tests. The tested coolants were pure wa-ter, 30/70 ethylene glycol (EG)/water, 30/70 propylene glycol (PG)/water, 50/50 EG/water and 50/50 PG/water mixtures. In all tests, the coolant temperature at the radiator inlet was kept at 90°C, while the coolant flow rate was varied between 0.10–0.25 l/s with 0.05 l/s increments. Furthermore, the air temperature at the ra-diator inlet was kept at 25, 30 and 35°C, and the air speed passing over the radia-tor was varied between 1–4 m/s with 1 m/s increments. The thermal performance of the radiator was evaluated by locating the measured coolant flow rate and coolant inlet/outlet temperatures into the conservation of energy equation. It was found that water yielded the highest radiator heat rejection rates. Compared with water, 30/70 EG/water, 50/50 EG/water, 30/70 PG/water, 50/50 PG/water mix-tures yielded on average 3.50%, 7.89%, 8.28%, 11.46% lower radiator heat rejec-tion rates, respectively. Since PG has some advantages over EG such as lower cost and toxicity, PG mixtures can be employed as antifreeze instead of EG mix-tures in expense of a slight decrease in the thermal performance.

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Section: Introductionmentioning

confidence: 99%