diff --git a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleDistributionInjection/InjectedParticleDistributionInjection.C b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleDistributionInjection/InjectedParticleDistributionInjection.C
index 3cdad615aba9ca38d449b5534fe3d670ca204e8f..8bc762c114acb0daf8ef9dd5a9bfa5eb6bb3423a 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleDistributionInjection/InjectedParticleDistributionInjection.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleDistributionInjection/InjectedParticleDistributionInjection.C
@@ -179,7 +179,7 @@ void Foam::InjectedParticleDistributionInjection<CloudType>::initialise()
                 sumPow3 += pow3(diameters[particlei]);
             }
 
-            const scalar volume = sumPow3*mathematical::pi/16.0;
+            const scalar volume = sumPow3*mathematical::pi/6.0;
             sumVolume += volume;
             volumeFlowRate_[injectori] = volume/dTime;
 
diff --git a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleInjection/InjectedParticleInjection.C b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleInjection/InjectedParticleInjection.C
index 76e05f08fa24b01b8fe2f7e3d153e0e6d8a6ebeb..cd3f5ae3447e4ea74e95d8f5765a4190c1a7eabd 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleInjection/InjectedParticleInjection.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectedParticleInjection/InjectedParticleInjection.C
@@ -119,7 +119,7 @@ void Foam::InjectedParticleInjection<CloudType>::initialise()
     scalar sumVolume = 0;
     forAll(volume, i)
     {
-        scalar vol = pow3(diameter_[i])*mathematical::pi/16.0;
+        scalar vol = pow3(diameter_[i])*mathematical::pi/6.0;
         volume[i] = vol;
         sumVolume += vol;
     }