For Fluid Mechanics you may consider the books:

1. Fluid Mechanics: Yunus A Cengel and John M Cimbala
2. Fluid mechanics: R.K. BANSAL

For Mechanical Operations you may consider the books:

1. Mechanical Operation for Chemical Engineer: CM narayanan and BC Bhattacharya
2. Unit Operation of Chemical Engineering: Warren L McCabe, Julia C. smith and Peter Harriott

I hope this might help. All the very best for your future endeavors!