What is the critical flow area inside the turbine housing of a turbocharger known as?

Name: What is the critical flow area inside the turbine housing of a turbocharger known as?
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The critical flow area inside the turbine housing of a turbocharger is known as the volute. The volute is a spiral-shaped passage that collects the exhaust gases from the engine and directs them onto the turbine wheel, thereby converting the exhaust gas energy into rotational energy to drive the compressor.

What Is the Critical Flow Area Inside the Turbine Housing