TY - JOUR

T1 - Optimal Pitch Size of a Biphilic Surface for Boiling Heat Transfer at Subatmospheric Pressures

AU - Malakhov, Ivan

AU - Surtaev, Anton

AU - Serdyukov, Vladimir

AU - Kosar, Ali

AU - Pavlenko, Alexander

N1 - The work was carried out under the state contract of IT SB RAS (No. 121031800216-1) and supported by the joint funding of RFBR (No. 20-58-46008, Anton Surtaev) and TUBITAK (No. 119N401, Ali Kosar).

PY - 2024/12/19

Y1 - 2024/12/19

N2 - To date, using biphilic surfaces is one of the most promising methods for enhancing heat transfer and critical heat flux during boiling simultaneously. However, most of studies on the effect of biphilic surfaces on boiling performance have been carried out under atmospheric pressure conditions. In this context, the issues of heat transfer enhancement and stabilization of the boiling process at subatmospheric pressures are particularly critical due to the interesting characteristics of boiling heat transfer and bubble dynamics at subatmospheric pressures and their practical significance including aerospace applications. This paper investigates the effect of the pitch size between hydrophobic spots on a biphilic surface on heat transfer and bubble dynamics during boiling at subatmospheric pressures (from 11.2 kPa up to atmospheric pressure). The data analysis using infrared thermography demonstrated that the maximum heat transfer rate was achieved on a surface with a uniform pitch size (6 mm) at all pressures. In this case, the heat transfer enhancement, compared a bare surface, reached 3.4 times. An analysis of the departure diameters of bubbles based on high-speed visualization indicated that the optimal configuration of the biphilic surface corresponds to the pitch size equal to the bubble departure diameter. Using high-speed visualization also demonstrated that an early transition to film boiling was evident for configurations with a very high density of hydrophobic spots (pitch size of 2 mm).

AB - To date, using biphilic surfaces is one of the most promising methods for enhancing heat transfer and critical heat flux during boiling simultaneously. However, most of studies on the effect of biphilic surfaces on boiling performance have been carried out under atmospheric pressure conditions. In this context, the issues of heat transfer enhancement and stabilization of the boiling process at subatmospheric pressures are particularly critical due to the interesting characteristics of boiling heat transfer and bubble dynamics at subatmospheric pressures and their practical significance including aerospace applications. This paper investigates the effect of the pitch size between hydrophobic spots on a biphilic surface on heat transfer and bubble dynamics during boiling at subatmospheric pressures (from 11.2 kPa up to atmospheric pressure). The data analysis using infrared thermography demonstrated that the maximum heat transfer rate was achieved on a surface with a uniform pitch size (6 mm) at all pressures. In this case, the heat transfer enhancement, compared a bare surface, reached 3.4 times. An analysis of the departure diameters of bubbles based on high-speed visualization indicated that the optimal configuration of the biphilic surface corresponds to the pitch size equal to the bubble departure diameter. Using high-speed visualization also demonstrated that an early transition to film boiling was evident for configurations with a very high density of hydrophobic spots (pitch size of 2 mm).

KW - Boiling

KW - biphilic surfaces

KW - heat transfer

KW - optimal configuration

KW - pitch size

KW - subatmospheric pressures

KW - biphilic surfaces

KW - Boiling

KW - heat transfer

KW - optimal configuration

KW - pitch size

KW - subatmospheric pressures

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85213501597&origin=inward&txGid=35b79f5b36c90c5f6a18f1e032482fe8

UR - https://www.mendeley.com/catalogue/31d7db8b-a079-3390-bd50-4e41d08e1c1f/

U2 - 10.32604/fhmt.2024.056664

DO - 10.32604/fhmt.2024.056664

M3 - Article

VL - 22

SP - 1645

EP - 1660

JO - Frontiers in Heat and Mass Transfer

JF - Frontiers in Heat and Mass Transfer

SN - 2151-8629

IS - 6

ER -