What does this research mean for the field?

In automotive windshield defrosting systems, the Coandã effect can induce steady mono- and bistable states of jet attachment to either the windshield or dashboard, as well as unsteady configurations characterized by Poissonian state switching, depending on geometric features like duct angle and dashboard proximity. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Investigate the occurrence of Coandã flow attachment, jet hysteresis, and dynamic switching between the windshield and dashboard within automotive defrosting systems.

September 5, 2026Experiments in FluidsOpen Access

Experimental investigation of Coandã flow attachment in automotive windshield defrosting

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Authors

ASAlexander Schukmann TGTimo Gericke ABAndrea Beck

Discussion

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Overview

Experimental study demonstrates Coandã jet attachment and stochastic switching in vehicle defrosting systems, highlighting risks to HVAC defrost performance.

Key Points

Investigate the occurrence of Coandã flow attachment, jet hysteresis, and dynamic switching between the windshield and dashboard within automotive defrosting systems.
Constructed a parameterized pseudo-2D passenger vehicle test rig featuring adjustable defrost duct angles and dashboard geometries.
Mapped flow fields and centerline windshield pressures using two-dimensional two-component particle image velocimetry (2D2C PIV) and pressure sensors.
Applied proper orthogonal decomposition to unsteady velocity fields to analyze jet switching modes and their temporal statistics.
Identified steady mono- and bistable flow regimes where the jet attaches to either surface, alongside unsteady regimes exhibiting Poissonian switching characteristics.
Demonstrated that dashboard proximity deflects the defrost jet and modifies centerline pressure distributions to mimic steeper or shallower duct angles.

Cite This Study

Schukmann et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd3726b95aff0620eab8e https://doi.org/10.1007/s00348-026-04295-y

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September 5, 2026Experiments in FluidsOpen Access

Experimental investigation of Coandã flow attachment in automotive windshield defrosting

View Full Paper

Ask AI

Bookmark

Authors

ASAlexander Schukmann TGTimo Gericke ABAndrea Beck

Discussion

Member takes

Overview

Experimental study demonstrates Coandã jet attachment and stochastic switching in vehicle defrosting systems, highlighting risks to HVAC defrost performance.

Key Points

Investigate the occurrence of Coandã flow attachment, jet hysteresis, and dynamic switching between the windshield and dashboard within automotive defrosting systems.
Constructed a parameterized pseudo-2D passenger vehicle test rig featuring adjustable defrost duct angles and dashboard geometries.
Mapped flow fields and centerline windshield pressures using two-dimensional two-component particle image velocimetry (2D2C PIV) and pressure sensors.
Applied proper orthogonal decomposition to unsteady velocity fields to analyze jet switching modes and their temporal statistics.
Identified steady mono- and bistable flow regimes where the jet attaches to either surface, alongside unsteady regimes exhibiting Poissonian switching characteristics.
Demonstrated that dashboard proximity deflects the defrost jet and modifies centerline pressure distributions to mimic steeper or shallower duct angles.

Cite This Study

Schukmann et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd3726b95aff0620eab8e https://doi.org/10.1007/s00348-026-04295-y

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