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An experimental and analytical investigation of the evaporation characteristics of engine oil film

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Abstract

This article presents an innovative study to enhance the accuracy of lubrication oil evaporation measurement from the oil film through thermal and sensitivity analyses. The study employs a novel experimental configuration to examine the influence of temperature variations and oil film thickness on oil evaporation. The oil film’s temperature is investigated comprehensively, applying experimental and theoretical approaches through different conditions. In order to enhance the accuracy of oil film temperature estimation, the study suggests introducing a correction factor accounting for the thermal properties of vapor during the multiphase liquid evaporation process. The findings indicate that small changes in the thickness of the oil film have no discernible effect on its temperature. In contrast, the evaporation characteristics of the oil film are notably influenced by the properties of its liquid and vapor phases. Incorporating the proposed correction factor (0.84) enhances the accuracy of the oil film temperature estimation equation. The findings presented in this study hold significant value for improving the accuracy of modeling considerations for the optimal configuration of piston rings in internal combustion engines.

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Abbreviations

a :

Thermal diffusion coefficient

A :

The film surface area/m−2

C :

Constant

c ∞ :

The concentration of lube oil in the vapor layer/kg m−3

c film :

The concentration of lube oil at the film surface/kg m−3

D c :

Diffusion coefficient/m2 h−1

D co :

Oil diffusivity coefficient at 100 kPa and 273.15 K

G r :

Grasse number

f :

Correction factor

g :

Gravitational acceleration/m s−2

h :

Convection heat transfer coefficient/W m−2 K−1

k :

Thermal conductivity/W m−1 K−1

L :

Characteristic length/m

m evap.oil :

Mass flux through boundary surface/kg m−2 h−1

Nu:

Average Nusselt number

P :

Circumference/m

P 0 :

Reference pressure/kPa

P film :

Oil film pressure/kPa

P r :

Prandtl number

Q net :

Net heat transfer/W m−2

Q conv :

Convective heat transfer/W m−2

R :

Specific gas constant of paraffin vapor/J kg−1 K−1

R total :

Total thermal resistance/K W−1

S film :

Oil film thickness/m

S v :

Vapor layer thickness/m

T :

Temperature/K or °C

T film :

Oil film temperature/K or °C

T m :

Mean temperature of the boundary layer/K or °C

T v :

Vapor layer temperature/K or °C

T w :

Surface wall temperature/K or °C

T p :

The temperature in the center of the plate/K or °C

U :

Overall heat transfer coefficient/W m−2 K−1

α v :

The coefficient of cubical expansion

β :

Material transmission coefficient/m h−1

ν :

The kinematic viscosity/m2 s−1

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Acknowledgements

The authors would like to appreciate Irankhodro Powertrain Company (IPCo) for their full financial and technical support of this research. The authors also appreciate the technical support from Dr. Arash Mohammadi, engine Labs Unit, Irankhodro Powertrain Company (IPCo), in many related areas.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

    Ahmed Qasim Almansoori & S. M. Agha Mirsalim

  2. Faculty of Mechanical Engineering, Semnan University, Semnan, Iran

    A. Hajialimohammadi

  3. Engine Labs Unit, Irankhodro Powertrain Company (IPCo), Tehran, Iran

    Mojtaba Mehrabivaghar

Authors
  1. Ahmed Qasim Almansoori
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  2. A. Hajialimohammadi
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  3. S. M. Agha Mirsalim
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Correspondence to A. Hajialimohammadi.

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Almansoori, A.Q., Hajialimohammadi, A., Mirsalim, S.M.A. et al. An experimental and analytical investigation of the evaporation characteristics of engine oil film. J Therm Anal Calorim 148, 12037–12048 (2023). https://doi.org/10.1007/s10973-023-12474-w

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