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Leadership is crucial for promoting employees’ environmental behaviour, essential for implementing sustainability initiatives. Academics and practitioners emphasize the need for integrated top-to-bottom actions to address environmental issues effectively. Thus, the purpose of this study is to investigate how Environment-Specific Servant Leadership (ESSL), via Employee Green Value (EGV), promotes Green Organizational Citizenship Behaviour (GOCB).

The present study adopted a quantitative cross-sectional approach. Additionally, a total of 333 data points were collected from employees working in various hospitals in Ranchi, India. The data and hypothesized relationships were analysed using PLS-SEM with SmartPLS 4.0 software.

The present results indicate that ESSL has a notable direct effect on employees’ GOCB. Moreover, EGV was identified as a partial mediator in the relationship between ESSL and GOCB.

The findings imply that leaders who prioritize sustainability and exhibit environmentally responsible behaviour, along with employees who value and prioritize green initiatives, can create a workplace that value pro-environmental practices. In this workplace employees are also likely to demonstrate green organizational citizenship behaviour, therefore promoting sustainable practices and outcomes.

This study provides valuable insight into the individual psychological mechanisms that drive voluntary participation in environmental protection and conservation efforts. Furthermore, the study also highlighted the relationship between ESSL, EGV and GOCB in terms of their work environment as well as highlighting the potential for organizations to create a more sustainable and socially responsible workplace.

Nowadays fossil fuel prices have increased; therefore, consumption of energy reduction has become a significant issue. Hence, this study aims to explore energy-efficient mechanical devices and their energy management.

This study focused on numerical analysis of various factors, including pressure drop, sensitivity, heat transfer and friction factor. This study compared the performance of two different arrangements of the heat exchanger: flat tube and staggered circular tube. This study also investigated the impact of varying coolant volume fractions.

This numerical analysis compares the geometric properties of flat and circular tube cross-sections while considering the flow of nanofluid inside and air outside. The current experimental investigation specifically examines the temperature-dependent characteristics (specific heat capacity, viscosity, density and thermal conductivity) of the stable ternary hybrid nanofluid mixture composed of Al₂O₃, CuO and TiO₂.

While several researchers have conducted numerical investigations on laminar flow in circular tubes, only a few studies are available on flat tube heat exchangers that use nanofluids just for internal flow. Furthermore, there is no simultaneous study on internal and exterior flow. Therefore, more investigation is necessary to examine the combined three-dimensional examination of shapes and their thermal-hydraulic influence using hybrid nanofluids.